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. He was head teacher at six successive schools before acting as district inspector of schools for the south-west region from June to December 1952. He was elected to the seat of Condamine in the Legislative Assembly of Queensland in 1953 as a Labor Party candidate.