Frederick John Shirley Tanner (28 April 1889 – 3 March 1965) was a British trade unionist. Born in Whitstable, Tanner grew up in London and became a fitter and turner at the age of 14. He joined the Social Democratic Federation and the Amalgamated Society of Engineers, soon becoming a prominent activist, and helping found the National Federation of Women Workers. During the 1910s, he was a leading syndicalist, active in the Industrial Syndicalist Education League, and jointly chaired the First International Syndicalist Congress.