The Department for International Development (DFID) was the government department of the United Kingdom responsible for administering foreign aid. The goal of the department was "to promote sustainable development and eliminate world poverty". DFID was headed by the United Kingdom's Secretary of State for International Development. The position was last held between 13 February 2020 and the department's abolishment on 2 September 2020 by Anne-Marie Trevelyan. In a 2010 report by the Development Assistance Committee (DAC), DFID was described as "an international development leader in times of global crisis". The UK aid logo is often used to publicly acknowledge DFID's development programmes are funded by UK taxpayers.

DFID's main programme areas of work were Education, Health, Social Services, Water Supply and Sanitation, Government and Civil Society, Economic Sector (including Infrastructure, Production Sectors and Developing Planning), Environment Protection, Research, and Humanitarian Assistance.

In 2009/10 DFID's Gross Public Expenditure on Development was £6.65bn. Of this £3.96bn was spent on Bilateral Aid (including debt relief, humanitarian assistance and project funding) and £2.46bn was spent on Multilateral Aid (including support to the EU, World Bank, UN and other related agencies). Although the Department for International Development's foreign aid budget was not affected by the cuts outlined by the Chancellor of the Exchequer's 2010 spending review, DFID will see their administration budgets slashed by approximately 19 percent over the next four years. This would mean a reduction in back-office costs to account for only 2 percent of their total spend by 2015.

In June 2013 as part of the 2013 Spending Round outcomes it was announced that DFID's total programme budget would increase to £10.3bn in 2014/15 and £11.1bn in 2015/16 to help meet the UK government's commitment to spend 0.7% of GNI (Gross National Income) on ODA (Official Development Assistance). DFID was responsible for the majority of UK ODA; projected to total £11.7bn in 2014/15 and £12.2bn in 2015/16. According to the OECD, 2020 official development assistance from the United Kingdom decreased by 10% to 18.6 billion.

In June 2020, Prime Minister Boris Johnson announced DFID was to be merged with the Foreign Office to create the Foreign, Commonwealth and Development Office.

The department was scrutinized by the International Development Committee.