The River Rother, a waterway in the northern midlands of England, gives its name to the town of Rotherham and to the Rother Valley parliamentary constituency. It rises in Pilsley in Derbyshire and flows in a generally northwards direction through the centre of Chesterfield, where it feeds the Chesterfield Canal, and on through the Rother Valley Country Park and several districts of Sheffield before joining the River Don at Rotherham in Yorkshire. Historically, it powered mills, mainly corn or flour mills, but most had ceased to operate by the early 20th century, and few of the mill buildings survive.

Rotherham is a market town in South Yorkshire, England. It is the largest settlement in the Metropolitan Borough of Rotherham. Rotherham is on the banks of both the Rivers Don and Rother, the latter of which the towns name originates.