Bangladesh (Bengali : বাংলাদেশ), officially known as the People's Republic of Bangladesh (Bengali: গণপ্রজাতন্ত্রী বাংলাদেশ), is a country in South Asia. It is bordered by India to its west, north and east; Myanmar to its southeast and separated from Nepal and Bhutan by the Chicken’s Neck corridor. To its south, it faces the Bay of Bengal. Bangladesh is the world's eighth-most populous country, with over 160 million people, and among the most densely populated countries. It forms part of the ethno-linguistic region of Bengal, along with the neighboring Indian states of West Bengal and Tripura.

The present-day borders of Bangladesh took shape during the Partition of Bengal and British India in 1947, when the region used to be known as East Pakistan, as a part of the newly formed state of Pakistan. It was separated from West Pakistan by 1,400 km of Indian territory. Due to political exclusion, ethnic and linguistic discrimination and economic neglect by the politically dominant western wing, nationalism, popular agitation and civil disobedience led to the Bangladesh Liberation War and independence in 1971. After independence, the new state endured poverty, famine, political turmoil and military coups. The restoration of democracy in 1991 has been followed by relative calm and economic progress.

Bangladesh is a unitary parliamentary republic with an elected parliament called the Jatiyo Sangshad. Bengalis form the country's largest ethnic group, along with indigenous peoples in northern and southeastern districts. Geographically, the country is dominated by the fertile Bengal delta, the world's largest delta. The four largest and constitutionally recognized religions in the country are Islam (89%), Hinduism (8%), Buddhism (1%) and Christianity (0.5%).

Bangladesh is identified as a Next Eleven economy. It has achieved significant strides in human and social development since independence, including in progress in gender equity, universal primary education, food production, health and population control.

Bangladesh is a founding member of SAARC, the Developing 8 Countries and BIMSTEC. It contributes one of the largest peacekeeping forces to the United Nations. It is a member of the Commonwealth of Nations, the Organization of Islamic Cooperation and the Non-Aligned Movement.