The Stamford bull run was a bull-running and bull-baiting event in the English town of Stamford, Lincolnshire. It was held on St Brice's Day, for perhaps more than 600 years, until 1839. A 1996 Journal of Popular Culture paper refers to the bull run as a festival, in "the broader context of the medieval if not aboriginal festival calendar", though works written during and shortly after the activity's later years variously describe it as a "riotous custom", a "hunt", an "old-fashioned, manly, English sport", an "ancient amusement", and – towards its end – an "illegal and disgraceful ... proceeding".

Bull running was a custom practised in England until the 19th century. It involved chasing a bull through the streets of a town until it was weakened, then slaughtering the animal and butchering it for its meat. Bull running became illegal in 1835, and the last bull run took place in Stamford, Lincolnshire, in 1839. The practice was not confined to any particular region, with bull runs also documented at Axbridge in the south west, Canterbury and Wokingham in the south east, Tutbury in the midlands, and Wisbech in the east.