An election to the 56th Parliament of the United Kingdom for the constituency area of Don Valley, held as part of the general election on 7 May 2015.
Labour hold by Caroline Flint with a majority of 8,885 - 20.9% - on a turnout of 59.6%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| FLINT, Caroline | Lab | 19,621 | 46.2% | 8.2% |
| JACKSON, Carl | Con | 10,736 | 25.3% | -4.4% |
| ASTON, Guy | UKIP | 9,963 | 23.5% | 19.1% |
| PATERSON, Rene | LD | 1,487 | 3.5% | -13.6% |
| WILLIAMS, Steve | TUSC | 437 | 1.0% | - |
| DUTTON, Louise | ED | 242 | 0.6% | -3.5% |
Under section 13(b) of the Representation of the People Act 1985, a candidate gaining 5% or less of the vote share will forfeit their deposit.
An electorate of 71,299, having a valid vote count of 42,486 and an invalid vote count of 171.
Result declared at 05:50 on 8 May 2015.