Rupert Philip Lonsdale (5 May 1905 – 25 April 1999) was a British submarine commander, prisoner of war and Anglican clergyman. He was forced to surrender his boat in World War II after he had succeeded in rescuing her and her crew from the sea bed after she struck a mine. He was honourably acquitted at the inevitable court-martial after spending five years as a prisoner of war. After the war he took holy orders serving in several Anglican parishes and in 1952 volunteered to go as a District Chaplain to Kenya to help find a peaceful solution to the Mau Mau Uprising.