Doncaster is a city in South Yorkshire, England, named after the River Don. It serves as the administrative centre of the City of Doncaster metropolitan borough and is the second largest settlement in South Yorkshire after Sheffield. The city is situated in the Don Valley on the western edge of the Humberhead Levels and east of the Pennines.
The city is particularly noted for its racing and railway heritage. Doncaster had a population of 87,455 at the 2021 census, with its built-up area reaching 160,220 residents. The wider metropolitan borough encompasses a population of 308,100.