Tetley's Brewery (Joshua Tetley & Son Ltd) was an English regional brewery founded in 1822 by Joshua Tetley in Hunslet, now a suburb of Leeds, West Yorkshire. The beer was originally produced at the Leeds Brewery, which was later renamed the Leeds Tetley Brewery to avoid confusion with a microbrewery of the same name. A takeover of the nearby Melbourne Brewery in 1960 secured Tetley's position as the largest brewer in Leeds. That same year they merged with Walkers of Warrington to form Tetley Walker. Tetley Walker had an estate of over 1,000 tied houses in Yorkshire alone and a further 2,000 outside the county. In 1961 Tetley merged with Ind Coope of Burton upon Trent and Ansells of Birmingham to form Allied Breweries, then the world's largest brewing conglomerate. At its height in the 1960s, the Leeds Brewery employed a thousand people. In 1978 Allied merged with J. Lyons to form Allied Lyons. The brewery became the world's largest producer of cask ale during the 1980s. In 1998 Tetley was taken over by Carlsberg Group.
The Leeds Brewery was closed in 2011, and demolished in 2012, with production contracted out by Carlsberg to breweries in Wolverhampton, Tadcaster and Hartlepool.