Castleford is a town within the City of Wakefield district, West Yorkshire, England. It had a population of 45,106 at a 2021 population estimate. Historically in the West Riding of Yorkshire, to the north of the town centre the River Calder joins the River Aire and the Aire and Calder Navigation. It is located north east of Wakefield, north of Pontefract and south east of Leeds. Castleford is the largest town in the Wakefield district after Wakefield itself.
The town is the site of a Roman settlement. Within the historical Municipal Borough of Castleford are the suburbs of Airedale, Cutsyke, Ferry Fryston, Fryston Village, Glasshoughton, Half Acres, Hightown, Lock Lane, Townville, Wheldale and Whitwood.