Muhammad bin Nayef Al Saud (Arabic: ???? ?? ???? ?? ??? ?????? ?? ?????; born 30 August 1959) is a prominent member of the House of Saud.
He is a nephew of King Salman and grandson of the founding monarch King Abdulaziz.
He has served as First Deputy Prime Minister and Minister of Interior of Saudi Arabia and chairman of the Council for Political and Security Affairs.
On 29 April 2015, he was appointed Crown Prince by King Salman, making him first in line to the throne of Saudi Arabia.
On 21 June 2017 he was replaced as Crown Prince and First Deputy Prime Minister by the king's son, then Deputy Crown Prince Mohammad bin Salman, and relieved of all positions by royal decree of King Salman.