Thornhill is a village and former township on the southern outskirts of Dewsbury in the Kirklees district of West Yorkshire, England. Historically part of the West Riding of Yorkshire, Thornhill was absorbed into Dewsbury County Borough in 1910. It is located on a hill on the south side of the River Calder, and has extensive views of Dewsbury, Ossett and Wakefield. It is known for its collection of Anglo-Saxon crosses.

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.