Lieutenant Colonel Duncan Frederick Campbell, DSO (28 April 1876 Simcoe, Ontario – 4 September 1916) was Unionist MP for North Ayrshire who died in World War I. He served with the Lancashire Fusiliers in the Second Boer War 1899–1901, and was present at the Relief of Ladysmith. He was created a Companion of the Distinguished Service Order (DSO); "Duncan Frederick Campbell, Lieutenant, Lancashire Fusiliers. In recognition of services during the operations in South Africa" (London Gazette, 19 April 1901). He was promoted Captain 5 October 1901.