Benjamin Tillett (11 September 1860 – 27 January 1943) was a British socialist, trade union leader and politician. He was a leader of the "new unionism" of 1889 that focused on organizing unskilled workers. He played a major role in founding the Dockers Union. He enthusiastically supported the war effort in the First World War. He was pushed aside by Ernest Bevin during the consolidation that created the Transport and General Workers Union in 1922, who gave Tillett a subordinate position. Scholars stress his evangelical dedication to the labour cause, while noting his administrative weaknesses. Clegg Fox and Thompson described him as a demagogue and agitator grasping for fleeting popularity.
He was born in Bristol. He started work in a brickyard at eight years of age and was a "Risley" boy for two years. At 12 years of age, he served for six months on a fishing smack, was afterwards apprenticed to a bootmaker and then joined the Royal Navy. He was invalided out of the navy and made several voyages in merchant ships. He then settled at the London Docks, and took up work as a docker.
He began his career as a trade union organiser in 1887 by forming the Tea Operatives and General Labourers Union at Tilbury docks. Tillett and his union, renamed the Dock, Wharf, Riverside and General Labourers' Union, rose to prominence during the London Dock Strike (1889), although the strike itself began without union involvement. Tillett also played a prominent role as a strike leader in dock strikes in 1911 and 1912. He was instrumental in forming the National Transport Workers' Federation in 1910, along with Havelock Wilson of the Seamen's Union.
Tillett's union was the largest of the unions which came together in 1922 to form the Transport and General Workers' Union, however, it was Tillett's deputy, Ernest Bevin, rather than Tillett himself, who took the major role in bringing about the amalgamation. Bevin became the General Secretary of the new union, but Tillett held the post of International and Political Secretary until 1931 and retained his seat on the General Council of the Trades Union Congress until 1932.