Frederick Lytton Warner, MM (4 December 1875 – 17 January 1952) was an Australian politician who served as a Country Party member of the Legislative Assembly of Western Australia from 1933 to 1943, representing the seat of Mount Marshall.
Warner spent periods as a police constable in Perth, Guildford, Maylands, and Marble Bar.
Warner was awarded the Military Medal in 1918, for helping capture enemy machine guns.
He became prominent in local agricultural circles, and at the 1933 state election was elected to parliament as an Independent Country candidate, defeating John Lindsay (the sitting Country Party member) in Mount Marshall.
Warner sought (and received) Country Party endorsement for the 1936 election, and was re-elected with an increased majority.