Dewsbury is a market town in the Metropolitan Borough of Kirklees in West Yorkshire, England. It lies on the River Calder and on an arm of the Calder and Hebble Navigation waterway. It is to the west of Wakefield, east of Huddersfield and south of Leeds. Historically a part of the West Riding of Yorkshire, after undergoing a period of major growth in the 19th century as a mill town, Dewsbury went through a period of decline. Dewsbury forms part of the Heavy Woollen District of which it is the largest town. The population of the built-up area was 63,722 at the 2021 Census.