The United Nations Development Programme (UNDP) is a United Nations agency tasked with helping countries eliminate poverty and achieve sustainable economic growth and human development. The UNDP emphasizes on developing local capacity towards long-term self-sufficiency and prosperity.

Based at the headquarters of the United Nations in New York City, it is the largest UN development aid agency, with offices in 177 countries. The UNDP is funded entirely by voluntary contributions from UN member states.

The UNDP was founded on 22 November 1965 through the merger of the Expanded Programme of Technical Assistance (EPTA) and the Special Fund in 1958. The rationale was to "avoid duplication of [their] activities". The EPTA was set up in 1949 to support the economic and political aspects of underdeveloped countries while the Special Fund was to enlarge the scope of UN technical assistance. The Special Fund arose from the idea of a Special United Nations Fund for Economic Development (SUNFED) (which was initially known as the United Nations Fund for Economic Development (UNFED).

Countries such as the Nordic countries were proponents of such a United Nations (UN) controlled fund. However, the fund was opposed by other developed countries, especially by the United States, which were wary of the Third World dominating such funding and preferred it to be under the auspices of the World Bank. The concept of SUNFED was dropped to form the Special Fund. This Special Fund was a compromise over the SUNFED concept: it did not provide investment capital but only helped to bring pre-conditions for private investment.

With the US proposing and creating the International Development Association within the World Bank's umbrella, the EPTA and the Special Fund appeared to be conducting similar work. In 1962, the United Nations Economic and Social Council asked the Secretary-General to consider the merits and disadvantages of merging UN technical assistance programmes and in 1966, the EPTA and the Special Fund merged to form the UNDP.

In 2022, UNDP's budget was US$6,737.92 million.

The following table lists the top 15 DAC 5 Digit Sectors to which UNDP has committed funding, as recorded in its International Aid Transparency Initiative (IATI) publications. The UNDP claims on the IATI Registry website that the data covers 100% of development flows.

UNDP topped the Aid Transparency Index published by Publish What You Fund in 2015 and 2016, with an excellent score of 93.3%.