Erewash (/ˈɛrəwɒʃ/) is a constituency[n 1] in Derbyshire represented in the House of Commons of the UK Parliament since 2024 by Adam Thompson of Labour.

[n 2] 1983–1997: The Borough of Erewash wards of Breaston, Cotmanhay, Dale Abbey, Derby Road East, Derby Road West, Draycott, Ilkeston Central, Ilkeston North, Ilkeston South, Kirk Hallam North, Kirk Hallam South, Long Eaton Central, Nottingham Road, Ockbrook and Borrowash, Old Park, Sandiacre North, Sandiacre South, Sawley, Victoria, West Hallam, and Wilsthorpe.

1997–2010: The Borough of Erewash wards of Abbotsford, Breaston, Cotmanhay, Dale Abbey, Derby Road East, Derby Road West, Draycott, Ilkeston Central, Ilkeston North, Ilkeston South, Kirk Hallam North, Kirk Hallam South, Long Eaton Central, Nottingham Road, Ockbrook and Borrowash, Old Park, Sandiacre North, Sandiacre South, Sawley, Victoria, West Hallam, and Wilsthorpe.

This took electoral wards from the existing Erewash seat, as well as making some minor alterations in neighbouring constituencies.

As an area which is neither especially wealthy nor especially poor, Erewash is described by political commentators as a "key marginal seat" in general elections.