The Bangladeshi diaspora (Bengali: প্রবাসী বাংলাদেশী) are people of Bangladeshi birth, descent or origin who live outside of Bangladesh. According to the United Nations International Organization for Migration there are almost 8.7 million Bangladeshis living abroad, the sixth highest country of origin for international migrants in the world. Annual remittances transferred to Bangladesh were almost $30.04 billion in 2024, third highest in South Asia.

The largest Bangladeshi diaspora population is in Pakistan. There are also significant migrant communities across various Arab states of the Persian Gulf, particularly in Saudi Arabia, The United Arab Emirates and Oman, where Bangladeshis are primarily employed as foreign workers. The United Kingdom is home to the largest Bangladeshi community in Europe. British Bangladeshis are mainly concentrated in London boroughs such as (Tower Hamlets and Newham); the migration to Britain is mainly attributed with chain migration from the Sylhet Division. In addition to the UK and the Middle East, Bangladeshis also have a significant presence in the United States. Other countries where there are significant Bangladeshi communities include Malaysia, South Africa, Singapore, Italy, Canada, and Australia. The majority of the Bangladeshi diaspora are Muslim, with a significant Hindu minority.

Bangladeshi diaspora movements and settlements abroad have divergent histories and challenges, with the diaspora in the Gulf Cooperation Council states focused on ensuring continuous labor migration flows and reducing labor-related abuses, while in the US and UK, a major challenge is the growing intergenerational divides.

According to the Maldivian foreign ministry; some 50,000 Bangladeshi were working in there in 2011, a nation of only around 400,000 people, with a third having no valid documents or registration.

Bangladeshis in the Middle East form the largest part of the worldwide Bangladeshi diaspora. Between 2.3 million and 2.9 million live within the Middle East.

More than two million are in Saudi Arabia. The United Arab Emirates is home to 706,000. Oman has about 680,242 Bangladeshis as of 2018. There is a Bangladeshi school in the city of Muscat, in Oman, called Bangladesh School Muscat. Qatar has about 400,000 Bangladeshis as of 2019. Bangladeshis in Qatar make more than 12.5% of the Qatar population. Kuwait has about 350,000 Bangladeshis as of 2020. Bahrain has about 180,000 Bangladeshis as of 2017.

The introduction of Islam to the Bengali people has generated a connection to the Arabian Peninsula, as Muslims are required to visit the land once in their lifetime to complete the Hajj pilgrimage. Several Bengali sultans funded Islamic institutions in the Hejaz, which popularly became known by the Arabs as Bangali Madaris. It is unknown when Bengalis began settling in Arab lands though an early example is that of Haji Shariatullah's teacher Mawlana Murad, who was permanently residing in the city of Mecca in the early 1800s. There are about three major Bangladeshi schools in Saudi Arabia in Riyadh, Jeddah and Dammam.

There are 706,000 Bangladeshis residing in the United Arab Emirates as of 2020. There is one Bangladeshi school in UAE called Shaikh Khalifa Bin Zayed Bangladesh Islamia School in Abu Dhabi. Bangladeshis make up around 7% of the UAE population and are 3rd largest community in the UAE.