Wath-upon-Dearne (also known as Wath-on-Dearne or simply Wath) is a small town on the south side of the Dearne Valley in the historic county of the West Riding of Yorkshire and the Metropolitan Borough of Rotherham, South Yorkshire, England, lying 5 miles (8 km) north of Rotherham, almost midway between Barnsley and Doncaster. It has a population of 16,787. It is twinned with Saint-Jean-de-Bournay, in France.