Don Valley was a constituency[n 1] in South Yorkshire represented in the House of Commons of the UK Parliament since 2019 by Nick Fletcher of the Conservative Party.

1983—1997: The Metropolitan Borough of Doncaster wards of Conisbrough, Edlington and Warmsworth, Mexborough, Richmond, Rossington, South East, and Southern Parks.

1997—2010: The Metropolitan Borough of Doncaster wards of Conisbrough, Edlington and Warmsworth, Hatfield, Rossington, South East, and Southern Parks.

2010—2024: The Metropolitan Borough of Doncaster wards of Conisbrough and Denaby, Edlington and Warmsworth, Finningley, Hatfield, Rossington, Thorne, and Torne Valley.

The current constituency consists of the southern Borough of Doncaster, from Hatfield and the Humberhead Peatlands Nature Reserve in the north and northeast, through Branton, Auckley, and Rossington, to the Torne Valley electoral ward which consists of Wadworth, Tickhill, Braithwell, and in the west Conisbrough.