Idi Amin Dada Oumee (, UK also ; c. 1925 – 16 August 2003) was a Ugandan military officer and politician who served as the third president of Uganda from 1971 to 1979. He ruled as a military dictator and is considered one of the most brutal despots in modern world history.

Amin was born in Koboko in what is now northwest Uganda to a Kakwa father and Lugbara mother. In 1946, he joined the King's African Rifles (KAR) of the British Colonial Army as a cook. He rose to the rank of lieutenant, taking part in British actions against Somali rebels and then the Mau Mau Uprising in Kenya. Uganda gained independence from the United Kingdom in 1962, and Amin remained in the army, rising to the position of major and being appointed commander of the Uganda Army in 1965. He became aware that Ugandan President Milton Obote was planning to arrest him for misappropriating army funds, so he launched the 1971 Ugandan coup d'état and declared himself president.

During his years in power, Amin shifted from being a pro-Western ruler enjoying considerable support from Israel to being backed by Libya's Muammar Gaddafi, Zaire's Mobutu Sese Seko, the Soviet Union, and East Germany. In 1972, Amin expelled Asians, a majority of whom were Indian-Ugandans, leading India to sever diplomatic relations with his regime. In 1975, Amin became the chairman of the Organisation of African Unity (OAU), a Pan-Africanist group designed to promote solidarity among African states. Uganda was a member of the United Nations Commission on Human Rights from 1977 to 1979. The United Kingdom broke diplomatic relations with Uganda in 1977, and Amin declared that he had defeated the British and added "CBE" to his title for "Conqueror of the British Empire".

As Amin's rule progressed into the late 1970s, there was increased unrest against his persecution of certain ethnic groups and political dissidents, along with Uganda's very poor international standing due to Amin's support for the terrorist hijackers in Operation Entebbe. He then attempted to annex Tanzania's Kagera Region in 1978. The Tanzanian president Julius Nyerere ordered his troops to invade Uganda in response. Tanzanian Army and rebel forces successfully captured Kampala in 1979 and ousted Amin from power. Amin went into exile, first in Libya, then Iraq, and finally in Saudi Arabia, where he lived until his death in 2003.

Amin's rule was characterised by rampant human rights abuses, including political repression, ethnic persecution and extrajudicial killings, as well as nepotism, corruption, and gross economic mismanagement. International observers and human rights groups estimate that between 100,000 and 500,000 people were killed under his regime.