Sir William Lawther (20 May 1889 – 1 February 1976) was a politician and trade union leader in the United Kingdom. Born in Choppington, in Northumberland, Lawther was educated at Choppington Colliery School, then became a coal miner. He became active in the Northumberland Miners' Association, which funded him to study at the Central Labour College. Lawther retired from his trade union posts in 1954, and died in 1976.