Barnsley ">['baːnzlɛ]) is a large town in South Yorkshire, England, located halfway between Leeds and Sheffield. Historically in the West Riding of Yorkshire, the town centre lies on the west bank of the Dearne Valley. Barnsley is surrounded by several smaller settlements which together form the Metropolitan Borough of Barnsley, of which Barnsley is the largest and its administrative centre. At the 2011 Census, Barnsley had a population of 91,297.

Barnsley is a former industrial town centred on coal mining and glassmaking. Although both industries declined in the 20th century, Barnsley's culture is rooted in its industrial heritage and it has a tradition of brass bands, originally created as social clubs by its mining communities. It is also home of the Barnsley chop.

The town is accessed from junctions 36, 37 and 38 of the M1 motorway and has a railway station on the Hallam and Penistone Lines. Barnsley F.C. is the local football club.