Idris (; El Sayyid Prince Muhammad Idris bin Muhammad al-Mahdi as-Senussi; 13 March 1890 – 25 May 1983) was a Libyan political and religious leader. He was the Emir of Cyrenaica. Idris was the King of the United Kingdom of Libya (renamed as the Kingdom of Libya in 1963) from 1951 to 1969. He was the chief of the Senussi Muslim order.