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Bangladesh , officially the People's Republic of Bangladesh, is a country in South Asia. It is the eighth-most-populous country in the world, with a population of around 169 million people in an area of 148,460 square kilometres (57,320 sq mi). Bangladesh is among the most densely populated countries in the world, and shares land borders with India to the west, north, and east, and Myanmar to the southeast; to the south it has a coastline along the Bay of Bengal. It is narrowly separated from Bhutan and Nepal by the Siliguri Corridor; and from China by the Indian state of Sikkim in the north. Dhaka, the capital and largest city, is the nation's political, financial and cultural centre. Chittagong, the second-largest city, is the busiest port on the Bay of Bengal. The official language is Bengali, one of the easternmost branches of the Indo-European language family.
Bangladesh forms the sovereign part of the historic and ethnolinguistic region of Bengal, which was divided during the Partition of India in 1947. The country has a Bengali Muslim majority. Ancient Bengal was an important cultural centre in the Indian subcontinent as the home of the states of Vanga, Pundra, Gangaridai, Gauda, Samatata, and Harikela. The Mauryan, Gupta, Pala, Sena, Chandra and Deva dynasties were the last pre-Islamic rulers of Bengal. The Muslim conquest of Bengal began in 1204 when Bakhtiar Khalji overran northern Bengal and invaded Tibet. Becoming part of the Delhi Sultanate, three city-states emerged in the 14th century with much of eastern Bengal being ruled from Sonargaon. Sufi missionary leaders like Sultan Balkhi, Shah Jalal and Shah Makhdum Rupos helped in spreading Muslim rule. The region was unified into an independent, unitary Bengal Sultanate. Under Mughal rule, eastern Bengal continued to prosper as the melting pot of Muslims in the eastern subcontinent and attracted traders from around the world. The Bengali elite were among the richest people in the world due to strong trade networks like the muslin trade which supplied textiles, such as 40% of Dutch imports from Asia. Mughal Bengal became increasingly assertive and independent under the Nawabs of Bengal in the 18th century. In 1757, the betrayal of Mir Jafar resulted in the defeat of Nawab Siraj-ud-Daulah to the British East India Company and eventual British dominance across South Asia. The Bengal Presidency grew into the largest administrative unit in British India. The creation of Eastern Bengal and Assam in 1905 set a precedent for the emergence of Bangladesh. In 1940, the first Prime Minister of Bengal supported the Lahore Resolution with the hope of creating a state in the eastern subcontinent. Prior to the partition of Bengal, the Prime Minister of Bengal proposed a Bengali sovereign state. A referendum and the announcement of the Radcliffe Line established the present-day territorial boundary of Bangladesh.

In 1947, East Bengal became the most populous province in the Dominion of Pakistan. It was renamed as East Pakistan, with Dhaka becoming the country's legislative capital. The Bengali Language Movement in 1952; the East Bengali legislative election, 1954; the 1958 Pakistani coup d'état; the Six point movement of 1966; and the 1970 Pakistani general election resulted in the rise of Bengali nationalism and pro-democracy movements in East Pakistan. The refusal of the Pakistani military junta to transfer power to the Awami League led by Sheikh Mujibur Rahman led to the Bangladesh Liberation War in 1971, in which the Mukti Bahini aided by India waged a successful armed revolution. The conflict saw the 1971 Bangladesh genocide and the massacre of pro-independence Bengali civilians, including intellectuals. The new state of Bangladesh became the first constitutionally secular state in South Asia in 1972. Islam was declared the state religion in 1988. In 2010, the Bangladesh Supreme Court reaffirmed secular principles in the constitution. A middle power in the Indo-Pacific, Bangladesh is the second-largest economy in South Asia. It maintains the third-largest military in the region and is a major contributor to UN peacekeeping operations. The large Muslim population of Bangladesh makes it the third-largest Muslim-majority country. Bangladesh is a unitary parliamentary constitutional republic based on the Westminster system. Bengalis make up 99% of the total population of Bangladesh. The country consists of eight divisions, 64 districts and 495 subdistricts. It hosts one of the largest refugee populations in the world due to the Rohingya genocide. Bangladesh faces many challenges, particularly corruption and effects of climate change. Bangladesh has been a leader within the Climate Vulnerable Forum. It hosts the headquarters of BIMSTEC. It is a founding member of SAARC, as well as a member of the Organisation of Islamic Cooperation and the Commonwealth of Nations.

The etymology of Bangladesh ("Bengali Country") can be traced to the early 20th century, when Bengali patriotic songs, such as Namo Namo Namo Bangladesh Momo by Kazi Nazrul Islam and Aaji Bangladesher Hridoy by Rabindranath Tagore, used the term. The term Bangladesh was often written as two words, Bangla Desh, in the past. Starting in the 1950s, Bengali nationalists used the term in political rallies in East Pakistan. The term Bangla is a major name for both the Bengal region and the Bengali language. The origins of the term Bangla are unclear, with theories pointing to a Bronze Age proto-Dravidian tribe, the Austric word "Bonga" (Sun god), and the Iron Age Vanga Kingdom. The earliest known usage of the term is the Nesari plate in 805 AD. The term Vangaladesa is found in 11th-century South Indian records. The term gained official status during the Sultanate of Bengal in the 14th century. Shamsuddin Ilyas Shah proclaimed himself as the first "Shah of Bangala" in 1342. The word Bangāl became the most common name for the region during the Islamic period. 16th-century historian Abu'l-Fazl ibn Mubarak mentions in his Ain-i-Akbari that the addition of the suffix "al" came from the fact that the ancient rajahs of the land raised mounds of earth 10 feet high and 20 in breadth in lowlands at the foot of the hills which were called "al". This is also mentioned in Ghulam Husain Salim's Riyaz-us-Salatin. The Indo-Aryan suffix Desh is derived from the Sanskrit word deśha, which means "land" or "country". Hence, the name Bangladesh means "Land of Bengal" or "Country of Bengal".

Stone Age tools have been found in different parts of Bangladesh. Remnants of Copper Age settlements date back 4,000 years. Ancient Bengal was settled by Austroasiatics, Tibeto-Burmans, Dravidians and Indo-Aryans in consecutive waves of migration. Archaeological evidence confirms that by the second millennium BCE, rice-cultivating communities inhabited the region. By the 11th century people lived in systemically aligned housing, buried their dead, and manufactured copper ornaments and black and red pottery. The Ganges, Brahmaputra and Meghna rivers were natural arteries for communication and transportation, and estuaries on the Bay of Bengal permitted maritime trade. The early Iron Age saw the development of metal weaponry, coinage, agriculture and irrigation. Major urban settlements formed during the late Iron Age, in the mid-first millennium BCE, when the Northern Black Polished Ware culture developed. In 1879, Alexander Cunningham identified Mahasthangarh as the capital of the Pundra Kingdom mentioned in the Rigveda. The oldest inscription in Bangladesh was found in Mahasthangarh and dates from the 3rd century BCE. It is written in the Brahmi script. Greek and Roman records of the ancient Gangaridai Kingdom, which (according to legend) deterred the invasion of Alexander the Great, are linked to the fort city in Wari-Bateshwar. The site is also identified with the prosperous trading centre of Souanagoura listed on Ptolemy's world map. Roman geographers noted a large seaport in southeastern Bengal, corresponding to the present-day Chittagong region. Ancient Buddhist and Hindu states which ruled Bangladesh included the Vanga, Samatata and Pundra kingdoms, the Mauryan and Gupta Empires, the Varman dynasty, Shashanka's kingdom, the Khadga and Candra dynasties, the Pala Empire, the Sena dynasty, the Harikela kingdom and the Deva dynasty. These states had well-developed currencies, banking, shipping, architecture, and art, and the ancient universities of Bikrampur and Mainamati hosted scholars and students from other parts of Asia. Gopala I was the first ever elected ruler of the region in 750 AD, during a time of mass turmoil the people of Bengal elected him to restore stability in the region at which he was successful went on to form the Pala dynasty that ruled until 1161 AD during with time Bengal prospered. Xuanzang of China was a noted scholar who resided at the Somapura Mahavihara (the largest monastery in ancient India), and Atisa travelled from Bengal to Tibet to preach Buddhism. The earliest form of the Bengali language emerged during the eighth century. Seafarers in the Bay of Bengal where modern Bangladesh is now located, have also been sailing and trading with Southeast Asia and exported Buddhist and Hindu cultures to the region since the early Christian era.

The early history of Islam in Bengal is divided into two phases. The first phase is the period of maritime trade with Arabia and Persia between the 8th and 12th centuries. The second phase covers centuries of Muslim dynastic rule after the Islamic conquest of Bengal. The writings of Al-Idrisi, Ibn Hawqal, Al-Masudi, Ibn Khordadbeh and Sulaiman record the maritime links between Arabia, Persia and Bengal. Muslim trade with Bengal flourished after the fall of the Sasanian Empire and the Arab takeover of Persian trade routes. Much of this trade occurred with southeastern Bengal in areas east of the Meghna River. There is speculation regarding the presence of a Muslim community in Bangladesh as early as 690 CE; this is based on the discovery of one of South Asia's oldest mosques in northern Bangladesh. Bengal was possibly used as a transit route to China by the earliest Muslims. Abbasid coins have been discovered in the archaeological ruins of Paharpur and Mainamati. A collection of Sasanian, Umayyad and Abbasid coins are preserved in the Bangladesh National Museum.

The Muslim conquest of Bengal began with the 1204 Ghurid expeditions led by Muhammad bin Bakhtiyar Khalji, who overran the Sena capital in Gauda and led the first Muslim army into Tibet. Bengal was ruled by the Sultans of the Delhi Sultanate for a century under the Mamluk, Balban, and Tughluq dynasties. In the 14th century, three city-states emerged in Bengal, including Sonargaon led by Fakhruddin Mubarak Shah, Satgaon led by Shamsuddin Ilyas Shah and Lakhnauti led by Alauddin Ali Shah. These city-states were led by former governors who declared independence from Delhi. In 1352, Shamsuddin Ilyas Shah united the three city-states into a single, unitary and independent Bengal Sultanate. The new Sultan of Bengal led the first Muslim army into Nepal and forced the Sultan of Delhi to retreat during an invasion. The army of Ilyas Shah reached as far as Varanasi in the northwest, Kathmandu in the north, Kamarupa in the east and Orissa in the south. During the reign of Sikandar Shah, Delhi recognised Bengal's independence. The Bengal Sultanate established a network of mint towns which acted as a provincial capitals where the Sultan's currency was minted. As Bengal became the easternmost frontier of the Islamic world, the Bengali language crystallized as an official court language during the Bengal Sultanate, giving rise to various prominent writers. The sultanate was evolving as a commercialized and monetized economy, and as a melting pot of Muslim political, mercantile and military elites. The two most prominent dynasties of the Bengal Sultanate were the Ilyas Shahi and Hussain Shahi dynasties. The reign of Sultan Ghiyasuddin Azam Shah saw the opening of diplomatic relations with Ming China. The reign of the Sultan Jalaluddin Muhammad Shah saw the development of Bengali architecture. During the early 15th century, Bengal aided the Restoration of Min Saw Mon in Arakan, which led to the latter becoming a tributary state of Bengal. During the reign of Sultan Alauddin Hussain Shah, Bengali forces penetrated deep into the Brahmaputra Valley—and being led by Shah Ismail Ghazi, conquered Assam, Jajnagar in Orissa, the Jaunpur Sultanate, Pratapgarh Kingdom and the island of Chandradwip. By 1500, Gaur became the fifth-most populous city in the world with a population of 200,000. Maritime trade linked Bengal with China, Malacca, Sumatra, Brunei, Portuguese India, East Africa, Arabia, Persia, Mesopotamia, Yemen and the Maldives. Bengali ships were among the biggest vessels plying the Bay of Bengal, Indian Ocean and Pacific Ocean. The Sultans permitted the opening of the Portuguese settlement in Chittagong. The disintegration of the Bengal Sultanate began with the intervention of the Suri Empire. Babur began invading Bengal after creating the Mughal Empire. The Bengal Sultanate collapsed with the overthrow of the Karrani dynasty during the reign of Akbar. However, the Bhati region of eastern Bengal continued to be ruled by aristocrats of the former Bengal Sultanate led by Isa Khan. They formed an independent federation called the Twelve Bhuiyans, with their capital in Sonargaon. In 1580, English traveler Ralph Fitch visited Bengal and saw the success of the Twelve Bhuiyans in withstanding against the Mughals. Fitch wrote that "for here are so many Rivers and Lands, that they (Mughals) flee from one to another, whereby his (Akbar) horsemen cannot prevail against them. Great store of cotton cloth is made here. Sinnergan (Sonargaon) is a leagues from Serrepore, where there is the best and finest cloth made of cotton that is in all India. The chief king of all these countries is called Isacan (Isa Khan), and he is chief of all the other kings". The Bhuiyans ultimately succumbed to the Mughals after Musa Khan was defeated.

The Mughal Empire controlled Bengal by the 17th century. During the reign of Emperor Akbar, the Bengali agrarian calendar was reformed to facilitate tax collection. The Mughals established Dhaka as a fort city and commercial metropolis, and it was the capital of Bengal Subah for 75 years. In 1666, the Mughals expelled the Arakanese from Chittagong. Mughal Bengal attracted foreign traders for its muslin and silk goods, and the Armenians were a notable merchant community. A Portuguese settlement in Chittagong flourished in the southeast, and a Dutch settlement in Rajshahi existed in the north. Bengal accounted for 40% of overall Dutch imports from Asia; including more than 50% of textiles and around 80% of silks. The Bengal Subah, described as the Paradise of the Nations, was the empire's wealthiest province, and a major global exporter, a notable centre of worldwide industries such as muslin, cotton textiles, silk, and shipbuilding. Its citizens also enjoyed one of the world's most superior living standards. During the 18th century, the Nawabs of Bengal became the region's de facto rulers, with a realm encompassing much of eastern South Asia. The Nawabs forged alliances with European colonial companies, making the region relatively prosperous early in the century. Bengal accounted for 50% of the gross domestic product of the empire. The Bengali economy relied on textile manufacturing, shipbuilding, saltpetre production, craftsmanship, and agricultural produce. Bengal was a major hub for international trade, renowned for its silk and cotton textiles worldwide. Bengal was also famed as a shipbuilding hub. Eastern Bengal was a thriving melting pot with strong trade and cultural networks. It was a relatively prosperous part of the subcontinent and the center of the Muslim population in the eastern subcontinent. The Bengali Muslim population was a product of conversion and religious evolution, and their pre-Islamic beliefs included elements of Buddhism and Hinduism. The construction of mosques, Islamic academies (madrasas) and Sufi monasteries (khanqahs) facilitated conversion, and Islamic cosmology played a significant role in developing Bengali Muslim society. Scholars have theorised that Bengalis were attracted to Islam by its egalitarian social order, which contrasted with the Hindu caste system. By the 15th century, Muslim poets were widely writing in the Bengali language. Syncretic cults, such as the Baul movement, emerged on the fringes of Bengali Muslim society. The Persianate culture was significant in Bengal, where cities like Sonargaon became the easternmost centres of Persian influence. In 1756, nawab Siraj ud-Daulah sought to rein in the rising power of the British East India Company by revoking their free trade rights and demanding the dismantling of their fortification in Calcutta. A military conflict ensued which culminated in the Battle of Plassey on 22 June 1757. Robert Clive exploited rivalries within the nawab's family, bribing Mir Jafar, the nawab's uncle and commander in chief, to ensure Siraj-ud-Daula's defeat. Clive rewarded Mir Jafar by making him nawab in place of Siraj-ud-Daula, but henceforth the position was a figurehead appointed and controlled by the company. After Plassey, the Mughal emperor ruled Bengal in name only. Effective power rested with the company. Historians often describe the battle as "the beginning of British colonial rule in South Asia". The Company replaced Mir Jafar with his son-in-law, Mir Kasim, in 1760. Mir Kasim challenged British control by allying with Mughal emperor Shah Alam II and the Nawab of Awadh, Shuja ud-Daulah, but the company decisively defeated the three at the Battle of Buxar on 23 October 1764. The resulting treaty made the Mughal emperor a puppet of the British and gave the company the right to collect taxes (diwani) in Bengal, Bihar, and Orissa, giving them de facto control of the region. The Company used Bengal's tax revenue to conquer the rest of India.

Two decades after Vasco Da Gama's landing in Calicut, the Bengal Sultanate permitted the Portuguese settlement in Chittagong to be established in 1528. It became the first European colonial enclave in Bengal. The Bengal Sultanate lost control of Chittagong in 1531 after Arakan declared independence and the established Kingdom of Mrauk U.
Portuguese ships from Goa and Malacca began frequenting the port city in the 16th century. The cartaz system was introduced and required all ships in the area to purchase naval trading licenses from the Portuguese settlement. Slave trade and piracy flourished. The nearby island of Sandwip was conquered in 1602. In 1615, the Portuguese Navy defeated a joint Dutch East India Company and Arakanese fleet near the coast of Chittagong.

The Bengal Sultan after 1534 allowed the Portuguese to create several settlements at Chitagoong, Satgaon, Hughli, Bandel, and Dhaka. In 1535, the Portuguese allied with the Bengal sultan and held the Teliagarhi pass 280 kilometres (170 mi) from Patna helping to avoid the invasion by the Mughals. By then several of the products came from Patna and the Portuguese send in traders, establishing a factory there since 1580. By the time the Portuguese assured military help against Sher Shah, the Mughals already had started to conquer the Sultanate of Ghiyasuddin Mahmud. The region accounted for 40% of Dutch imports outside the European continent. The eastern part of Bengal was globally prominent in industries such as textile manufacturing and shipbuilding, and it was a major exporter of silk and cotton textiles, steel, saltpeter, and agricultural and industrial produce in the world.
In 1666, the Mughal government of Bengal led by viceroy Shaista Khan moved to retake Chittagong from Portuguese and Arakanese control. The Anglo-Mughal War was witnessed in 1686.
After the 1757 Battle of Plassey, Bengal was the first region of the Indian subcontinent conquered by the British East India Company. The company formed the Presidency of Fort William, which administered the region until 1858. A notable aspect of Company rule was the Permanent Settlement, which established the feudal zamindari system; in addition, Company policies led to the deindustrialisation of Bengal's textile industry. The capital amassed by the East India Company in Bengal was invested in the emerging Industrial Revolution in Great Britain, in industries such as textile manufacturing. Economic mismanagement, alongside drought and a smallpox epidemic, directly led to the Great Bengal famine of 1770, which is estimated to have caused the deaths of between 1 million and 10 million people. Several rebellions broke out during the early 19th century (including one led by Titumir), as Company rule had displaced the Muslim ruling class from power. A conservative Islamic cleric, Haji Shariatullah, sought to overthrow the British by propagating Islamic revivalism. Several towns in Bangladesh participated in the Indian Rebellion of 1857 and pledged allegiance to the last Mughal emperor, Bahadur Shah Zafar, who was later exiled to neighbouring Burma.
The challenge posed to company rule by the failed Indian Mutiny led to the creation of the British Indian Empire as a crown colony. The British established several schools, colleges, and a university in Bangladesh. Syed Ahmed Khan and Ram Mohan Roy promoted modern and liberal education in the subcontinent, inspiring the Aligarh movement and the Bengal Renaissance. During the late 19th century, novelists, social reformers and feminists emerged from Muslim Bengali society. Electricity and municipal water systems were introduced in the 1890s; cinemas opened in many towns during the early 20th century. East Bengal's plantation economy was important to the British Empire, particularly its jute and tea. The British established tax-free river ports, such as the Port of Narayanganj, and large seaports like the Port of Chittagong.
Bengal had the highest gross domestic product in British India. Bengal was one of the first regions in Asia to have a railway. The first railway in what is now Bangladesh began operating in 1862. In comparison, Japan saw its first railway in 1872. The main railway companies in the region were the Eastern Bengal Railway and Assam Bengal Railway. Railways competed with waterborne transport to become one of the main mediums of transport. Supported by the Muslim aristocracy, the British government created the province of Eastern Bengal and Assam in 1905; the new province received increased investment in education, transport, and industry. However, the first partition of Bengal created an uproar in Calcutta and the Indian National Congress. In response to growing Hindu nationalism, the All India Muslim League was formed in Dhaka during the 1906 All India Muhammadan Educational Conference. The British government reorganised the provinces in 1912, reuniting East and West Bengal and making Assam a second province.

The Raj was slow to allow self-rule in the colonial subcontinent. It established the Bengal Legislative Council in 1862, and the council's native Bengali representation increased during the early 20th century. The Bengal Provincial Muslim League was formed in 1913 to advocate civil rights for Bengali Muslims within a constitutional framework. During the 1920s, the league was divided into factions supporting the Khilafat movement and favouring co-operation with the British to achieve self-rule. Segments of the Bengali elite supported Mustafa Kemal Atatürk's secularist forces. In 1929, the All Bengal Tenants Association was formed in the Bengal Legislative Council to counter the influence of the Hindu landed gentry, and the Indian Independence and Pakistan Movements strengthened during the early 20th century. After the Morley-Minto Reforms and the diarchy era in the legislatures of British India, the British government promised limited provincial autonomy in 1935. The Bengal Legislative Assembly, British India's largest legislature, was established in 1937.
Although it won most seats in 1937, the Bengal Congress boycotted the legislature. A. K. Fazlul Huq of the Krishak Praja Party was elected as the first Prime Minister of Bengal. In 1940 Huq supported the Lahore Resolution, which envisaged independent states in the subcontinent's northwestern and eastern Muslim-majority regions. The first Huq ministry, a coalition with the Bengal Provincial Muslim League, lasted until 1941; it was followed by a Huq coalition with the Hindu Mahasabha which lasted until 1943. Huq was succeeded by Khawaja Nazimuddin, who grappled with the effects of the Burma Campaign, the Bengal famine of 1943, which killed up to 3 million people, and the Quit India movement. In 1946, the Bengal Provincial Muslim League won the provincial election, taking 113 of the 250-seat assembly (the largest Muslim League mandate in British India). H. S. Suhrawardy, who made a final futile effort for a United Bengal in 1946, was the last premier of Bengal.

On 3 June 1947, the Mountbatten Plan outlined the partition of British India. On 20 June, the Bengal Legislative Assembly met to decide on the partition of Bengal. At the preliminary joint meeting, it was decided (120 votes to 90) that if the province remained united, it should join the Constituent Assembly of Pakistan. At a separate meeting of legislators from West Bengal, it was decided (58 votes to 21) that the province should be partitioned and West Bengal should join the Constituent Assembly of India. At another meeting of legislators from East Bengal, it was decided (106 votes to 35) that the province should not be partitioned and (107 votes to 34) that East Bengal should join the Constituent Assembly of Pakistan if Bengal was partitioned. On 6 July, the Sylhet region of Assam voted in a referendum to join East Bengal.
Cyril Radcliffe was tasked with drawing the borders of Pakistan and India, and the Radcliffe Line established the borders of present-day Bangladesh. The Radcliffe Line awarded two-thirds of Bengal as the eastern wing of Pakistan, although the medieval and early modern Bengali capitals of Gaur, Pandua and Murshidabad fell on the Indian side close to the border with Pakistan.

The Dominion of Pakistan was created on 14 August 1947. East Bengal, with Dhaka as its capital, was the most populous province of the 1947 Pakistani federation (led by Governor General Muhammad Ali Jinnah, who promised freedom of religion and secular democracy in the new state). Khawaja Nazimuddin was East Bengal's first chief minister with Frederick Chalmers Bourne its governor. The All Pakistan Awami Muslim League was formed in 1949. In 1950, the East Bengal Legislative Assembly enacted land reform, abolishing the Permanent Settlement and the zamindari system. The 1952 Bengali Language Movement was the first sign of friction between the country's geographically separated wings. The Awami Muslim League was renamed the more-secular Awami League in 1953. The first constituent assembly was dissolved in 1954; this was challenged by its East Bengali speaker, Maulvi Tamizuddin Khan. The United Front coalition swept aside the Muslim League in a landslide victory in the 1954 East Bengali legislative election. The following year, East Bengal was renamed East Pakistan as part of the One Unit programme, and the province became a vital part of the Southeast Asia Treaty Organization.

Pakistan adopted a new constitution in 1956. Three Bengalis were its Prime Minister until 1957: Nazimuddin, Mohammad Ali of Bogra and Suhrawardy. None of the three completed their terms and resigned from office. The Pakistan Army imposed military rule in 1958, and Ayub Khan was the country's strongman for 11 years. Political repression increased after the coup. Khan introduced a new constitution in 1962, replacing Pakistan's parliamentary system with a presidential and gubernatorial system (based on electoral college selection) known as Basic Democracy. In 1962 Dhaka became the seat of the National Assembly of Pakistan, a move seen as appeasing increased Bengali nationalism. The Pakistani government built the controversial Kaptai Dam, displacing the Chakma people from their indigenous homeland in the Chittagong Hill Tracts. During the 1965 presidential election, Fatima Jinnah lost to Ayub Khan despite support from the Combined Opposition alliance (which included the Awami League). The Indo-Pakistani War of 1965 blocked cross-border transport links with neighbouring India in what is described as a second partition. In 1966, Awami League leader Sheikh Mujibur Rahman announced a six-point movement for a federal parliamentary democracy.
According to senior World Bank officials, the Pakistani government practised extensive economic discrimination against East Pakistan. Despite generating 70 percent of Pakistan's export revenue with jute and tea, the Pakistani government invested most of its reserves on West Pakistan. Economists in East Pakistan, including Rehman Sobhan and Nurul Islam among others, demanded a separate foreign exchange account for the eastern wing. The economists paraphrased Pakistan's Two-Nation Theory ideology against India, by pointing to the existence of two different economies with Pakistan itself, dubbed the Two-Economies Theory. East Pakistan's foreign-exchange surplus was used to finance West Pakistani imports. The central government also refused to release foreign aid allocated for East Pakistan. The populist leader Sheikh Mujibur Rahman was arrested for treason in the Agartala Conspiracy Case and was released during the 1969 uprising in East Pakistan which resulted in Ayub Khan's resignation. General Yahya Khan assumed power, reintroducing martial law.
Ethnic and linguistic discrimination was common in Pakistan's civil and military services, in which Bengalis were under-represented. Fifteen percent of Pakistani central-government offices were occupied by East Pakistanis, who formed 10 percent of the military. Cultural discrimination also prevailed, making East Pakistan forge a distinct political identity. Authorities banned Bengali literature and music in state media, including the works of Nobel laureate Rabindranath Tagore. A cyclone devastated the coast of East Pakistan in 1970, killing an estimated 500,000 people, and the central government was criticised for its poor response. After the December 1970 elections, calls for the independence of East Bengal became louder; the Bengali-nationalist Awami League won 167 of 169 East Pakistani seats in the National Assembly. The League claimed the right to form a government and develop a new constitution but was strongly opposed by the Pakistani military and the Pakistan Peoples Party (led by Zulfikar Ali Bhutto).

In the first three months of 1971, negotiations began on the transfer of power. The Awami League wanted to develop a constitution based on its Six Points agenda; this was opposed by the Pakistani military, the Pakistan Peoples Party and the Muslim League factions. The Awami League received support from the main political parties in North-West Frontier Province and Baluchistan. Talks eventually broke down as the junta led by Yahya Khan prepared for a military operation in East Pakistan. The Bengali population was angered when Prime Minister-elect Sheikh Mujibur Rahman was prevented from taking the office. Civil disobedience erupted across East Pakistan, with loud calls for independence. Mujib addressed a pro-independence rally of nearly 2 million people on 7 March 1971, where he said, "This time the struggle is for our liberation. This time the struggle is for our independence. " The flag of Bangladesh was raised for the first time on 23 March, Pakistan's Republic Day. On midnight on 26 March 1971, military operations under the code name of Operation Searchlight began. The first targets were the student dormitories of Dhaka University, the police barracks in Dhaka's Rajarbagh locality, and Hindu neighborhoods in Old Dhaka. The Pakistan Army then proceeded to arrest Sheikh Mujibur Rahman and flew him to a jail in West Pakistan. Mujib's lawyer Kamal Hossain was also arrested. The army burnt down the Ittefaq newspaper's office. Before his arrest, Mujib proclaimed the independence of Bangladesh. Pakistani forces launched a widespread campaign of killings, torture, rape, arson and destruction across East Pakistan, targeting segments of the population perceived to be pro-Awami League and pro-independence. The Hindu minority was particularly targeted because of Pakistan's enmity with neighboring Hindu-majority India.
During the Bangladesh Liberation War, the Mukti Bahini emerged as the Bengali resistance force. A highly successful guerrilla war was fought against Pakistan. The Mukti Bahini combined defecting Bengali members of the Pakistani military with civilian volunteers. The Mukti Bahini was gradually organized into armed divisions over the course of the war. Bengalis continued to defect from Pakistan's diplomatic service, military, police and bureaucracy. In April, they helped Awami League leaders to set up the Provisional Government of Bangladesh, which operated in exile from Calcutta with the support of the Indian government until December 1971. The Mukti Bahini divided the war zone into eleven sectors, with each sector headed by a rebel officer of the Pakistani military. The Bangladesh Armed Forces was formally established in November 1971, when Bengali forces secured control of much of the countryside. The Mukti Bahini forced the railway network to shut down to stop Pakistani troop movements. Some of the notable operations of the Mukti Bahini included Operation Jackpot and Operation Barisal.
India intervened in the war on 3 December 1971, after Pakistan's failed pre-emptive air strikes on India's northwestern flank. India retaliated in both the western and eastern fronts. With a joint ground advance by Bangladeshi and Indian forces, coupled with air strikes by both India and the small Bangladeshi air contingent, the capital Dhaka was liberated from Pakistani occupation in mid-December. During the last phase of the war, both the Soviet Union and the United States dispatched naval forces to the Bay of Bengal in a Cold War standoff. The nine month long war ended with the surrender of Pakistani armed forces to the Bangladesh-India Allied Forces on 16 December 1971. Under international pressure, Pakistan released Mujib from imprisonment on 8 January 1972 and he was flown by the British Royal Air Force to a million-strong homecoming in Dhaka. Remaining Indian troops were withdrawn by 12 March 1972, three months after the war ended. The cause of Bangladeshi self-determination was recognised around the world. By August 1972, the new state was recognised by 86 countries. Pakistan recognised Bangladesh in 1974 after pressure from most of the Muslim countries.

The government of Bangladesh records the official death toll of the war at 3 million, including victims of atrocities and those who died from starvation. Minimum estimates for the number of those killed range between 300,000 and 500,000. An estimated 10 million refugees fled to neighboring India and 30 million were internally displaced. The war also saw the first recorded use of rape as a weapon of war, with an estimated 200,000 women being subjected to sexual abuse by the Pakistani army. The war saw the systematic targeting of Bengali elites, particularly intellectuas like university professors, poets, doctors, journalists, lawyers, and scientists. The Jamaat-e-Islami formed paramilitary militias, including the Razakars, Al-Badr and Al-Shams corps, which aided Pakistani troops and guided them to their intended targets. While Bengali Muslims bore the brunt of atrocities because of racial tensions with the largely Punjabi Muslim West Pakistani forces, the minority Bengali Hindu community was singled out for attacks by the Pakistani army; a legacy which has led Hindu nationalist groups to claim that the war was a Hindu genocide. Other communities, including the tribal people of the Chittagong Hill Tracts, Bengali Christians, Bengali Buddhists, Biharis and Urdu-speaking people also suffered atrocities, including reprisals from Bengali guerrillas. Pakistani nationalists frequently engage in genocide denial, downplaying the war's effects on Bengali Muslims and accuse Bengali forces of committing killings. Archer K. Blood, the US Consul General in East Pakistan at the time of the war, described the situation as "selective genocide", in which segments of the population were being systematically wiped out. The government, media, civil society and victims' groups of Bangladesh have often called on Pakistan to recognize the genocide and apologize to the Bangladeshi people. These calls have been supported by prominent Pakistanis. In 1974 and 2002, Pakistan formally expressed "regret" for what happened. In 2015, Pakistan denied any atrocities took place. In 2022, a bipartisan resolution was introduced in the US Congress to "Recognize the Bangladesh Genocide of 1971".

The constituent assembly adopted the constitution of Bangladesh on 4 November 1972, establishing a secular, multiparty parliamentary democracy. The new constitution included references to socialism, and Prime Minister Sheikh Mujibur Rahman nationalised major industries in 1972. A major reconstruction and rehabilitation programme was launched. The Awami League won the country's first general election in 1973, securing a large majority in the "Jatiyo Sangshad", the national parliament. Bangladesh joined the Commonwealth of Nations, the UN, the OIC and the Non-Aligned Movement, and Rahman strengthened ties with India. Amid growing agitation by the opposition National Awami Party and Jashod, he became increasingly authoritarian. Rahman amended the constitution, giving himself more emergency powers (including the suspension of fundamental rights). The Bangladesh famine of 1974 also worsened the political situation.