Dearne Valley was a Parliamentary constituency in South Yorkshire. The constituency was created in 1950 and abolished in 1983. Consisting of small towns and villages based around the Yorkshire coalfields, it was one of the Labour Party's safest seats with large majorities in its history between 20,000 and 30,000 votes over other parties.
The Urban Districts of Conisbrough, Darfield, Mexborough, Swinton, Wath upon Dearne, and Wombwell.