King Abdullah I of Jordan (1882 - July 20, 1951), known as Abdullah bin Husayn, was, successvively, Emir of Trans-Jordan (1921-1946), King of Transjordan (May 25, 1946 - 1949), and King of the Hashemite Kingdom of Jordan (1949-1951).

The son of the Hashemite Husayn ibn Ali, he fought as a pro-British partisan in World War I and received Trans-Jordan as a fief under British protection in 1921. His brother Faisal became King of Iraq.

Abdullah died at the hands of an assassin in Jerusalem while attending Friday prayers at the Dome of the Rock in the company of his grandson, Prince Hussein. He was succeeded by his son Talal; however, since Talal was mentally handicapped, Talal's son – the aforementioned Prince Hussein – became the effective ruler as King Hussein at the age of eighteen. Hussein was in turn succeeded by his half-British son, King Abdullah II.