Leslie Frank Louis "Les" Diplock CMG (16 September 1899 – 6 November 1983) was an Australian politician.Diplock was born in South Brisbane to house-painter Louis Diplock and Louisa May, née Lucas and attended state and private schools in Rockhampton. He was a student teacher from 1914 and taught in Rockhampton, Toowoomba and Bribie Island from 1918 to 1924. He married Olive Constance Becker on 20 December 1920 at Taroom.