Lieutenant-Colonel William Thomas Frederick Davies CMG DSO (13 August 1860 – 24 June 1947) was a South African surgeon, army officer and politician. Davies trained at Guy's Hospital in London. In the South African War he served as Surgeon-Major with the Imperial Light Horse and was awarded the Distinguished Service Order (DSO). From 1914 to 1915, he commanded the 2nd Imperial Light Horse in German South-West Africa, where he was wounded. From 1915 to 1917, he was a member of the South African House of Assembly, for which he was appointed Companion of the Order of St Michael and St George (CMG) in the 1920 New Year Honours.