Abdulaziz ibn Abdul Rahman ibn Faisal ibn Turki ibn Abdullah ibn Muhammad Al Saud (, ; 15 January 1875 - 9 November 1953), known in the West as Ibn Saud, was the first monarch and founder of Saudi Arabia, the third Saudi state. He was ruler of the whole Kingdom of Saudi Arabia from 23 September 1932 to 9 November 1953 but ruled parts of it as early as 1902.