Alan MacDougall Ritchie (born 1893, date of death unknown) was an officer in the British Army during World War II. Ritchie was a brigade commander of the 26th (East African) Brigade and the 21st (East African) Brigade in the King's African Rifles during the East African Campaign. As commander of the 21st (East African) Brigade (11th African Division), Ritchie was detached to 1st South African Division from 27 February until 6 April and, thereafter, to the 12th African Division.