Concemore Thomas Thwaites Cramp (19 March 1876 – 13 July 1933), known as Charlie Cramp, was a British trade unionist and political activist. Born in Staplehurst in Kent, Cramp worked as a gardener, before gaining employment with the Midland Railway. He worked as a porter based in Shipley and then Rotherham, where he was promoted to become a guard, and joined the Amalgamated Society of Railway Servants (ASRS). Soon after, he moved to Sheffield, where he married an Elizabeth Baker, also from Staplehurst.