Lieutenant Robert Hamond Elwes (1856 – 28 January 1881) was a British Army officer who was killed in action during the First Boer War. As a junior officer in the Grenadier Guards regiment, Elwes fought in the Battle of Laing's Nek where he died while leading a cavalry charge against Boer forces. His death was portrayed in Elizabeth Thompson's 1898 painting "Floreat Etona!".