David Louis Clemetson (1 October 1893 - 21 September 1918) was born in Jamaica, into a wealthy family. He was one of the first black people to serve as an officer in the British Army. He was commissioned in the Pembroke Yeomanry in October 1915, and he is thought to have been the only black person to hold the rank of lieutenant in the British Army during the First World War. He was killed in action in France in September 1918.