William Bromfield (24 January 1868 – 3 June 1950) was an English trade unionist and Labour Party politician from Leek in Staffordshire.
He was the town's Member of Parliament (MP) for all but four of the years between 1918 and 1945.
By 1907, Bromfield was the secretary of several of the unions which comprised the Leek Textile Federation.
Six of these unions merged in 1919 to form the Amalgamated Society of Textile Workers and Kindred Trades (ASTWKT), whose membership covered Staffordshire and South Cheshire, and Bromfield was the secretary of the ASTWKT from its formation in 1919 until 1942.