The Bangladeshi diaspora are people of Bangladeshi birth, descent or origin who live outside of Bangladesh. First-generation migrants may have moved abroad from Bangladesh for various reasons including better living conditions, to escape poverty, to support their financial condition, or to send money back to families there. The Ministry of Expatriates' Welfare and Overseas Employment estimates there are almost 7.5 million Bangladeshis living abroad, the fourth highest among the top 176 countries of origin for international migrants. Annual remittances transferred to Bangladesh were almost $23 billion in 2023, the seventh highest in the world and the third highest in South Asia.

Bengali, also known by its endonym Bangla, is an Indo-Aryan language from the Indo-European language family native to the Bengal region of South Asia. With Over 250 million native speakers and another 41 million as second language speakers as of 2024, Bengali is the sixth most spoken native language and the seventh most spoken language by the total number of speakers in the world. It is the fifth most spoken Indo-European language.