Idris (Arabic: إدريس, romanized: Idrīs, Muhammad Idris bin Muhammad al-Mahdi al-Sanusi; 13 March 1890 – 25 May 1983) was King of Libya from 24 December 1951 until his ousting in the 1 September 1969 coup d'état. He ruled over the United Kingdom of Libya from 1951 to 1963, after which the country became known as simply the Kingdom of Libya. Idris had served as Emir of Cyrenaica and Tripolitania from the 1920s until 1951. He also headed the Sanusi order.
Idris was born into the Senussi Order. When his cousin Ahmed Sharif as-Senussi abdicated as leader of the Order, Idris took his position. The Senussi campaign was taking place, with the British and Italians fighting the Order. Idris put an end to the hostilities and, through the Modus vivendi of Acroma, abandoned Ottoman protection. Between 1919 and 1920, Italy recognized Senussi control over most of Cyrenaica in exchange for the recognition of Italian sovereignty by Idris. Idris then led his Order in an unsuccessful attempt to conquer the eastern part of the Tripolitanian Republic.