Mansfield Brewery was a brewery and public house operating company established in 1855, that was based in the North Nottinghamshire market town of Mansfield, England. The main beer brewed was Mansfield Bitter, along with other popular brands including Riding Bitter, Marston Old Baily, and Marksman Lager. The brewery also boasted a large array of seasonal beers, including the "Deakins" range.