William Devenay (1864 – 12 May 1934) was a British trade unionist and politician.

Biography Born in Renfrew in Scotland, he found work as a dock labourer, and moved to London, also working for a time driving a bakers' van. He joined the Dock, Wharf, Riverside and General Labourers' Union, and was soon working full-time for the union as its London District Secretary.Labour Who's Who (1924), p.45 He also became active in the Independent Labour Party (ILP),John Marriott, The Culture of Labourism: The East End Between the Wars, pp.102–104 and in 1898 was elected as its first councillor in West Ham.Donald McDougall, Fifty years a borough, 1886–1936: the story of West Ham, p.272 The ILP affiliated to the Labour Party and, as more Labour councillors were elected, he became an alderman in 1911, and then Mayor of West Ham in 1919/20, the first former docker to become a Labour mayor. He also stood for Labour in Mile End at the 1918 United Kingdom general election, taking second place with 25.1% of the vote.F. W. S. Craig, British Parliamentary Election Results: 1918–1949

Devenay remained active in the Dockers' Union, becoming an assistant national organiser, and in 1911 was a leading figure in a strike of transport workers in London. Ben Tillett later described him as "...the plodder of the movement, and to his years of organising work is due a lot of the feeling aroused among the Transport Workers of London".Ben Tillett, History of the London transport workers strike, p.55 In 1922, the union became part of the new Transport and General Workers' Union (TGWU), and Devenay was appointed as secretary of its General Workers Group.Trades Union Congress, "Obituary: Alderman W. Devenay", Annual Report of the 1934 Trades Union Congress

In 1914, Devenay was appointed to the Port of London Authority, replacing Harry Orbell, and in 1930 he was made chair of its maintenance committee, the most senior position held to that date by any trade unionist on the body.Lincoln Gordon, The Public Corporation in Great Britain, p.31 He retired from his trade union posts in 1932, and died in May 1934.

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