Don Valley is a parliamentary constituency, consisting of the southern Borough of Doncaster, from Conisbrough to Hatfield. Created in 1915, it was long a coal mining stronghold. It is currently represented by the Labour MP Caroline Flint and is considered a safe Labour seat.

Members of Parliament

• Tom Williams , Labour
• Richard Kelley , Labour ( - 1979)
• Michael Welsh , Labour (1979 - 1983)
• Martin Redmond, Labour (1983 - 1997)
• Caroline Flint, Labour (1997 - )