An election to the 56th Parliament of the United Kingdom for the constituency area of Dagenham and Rainham, held as part of the general election on 7 May 2015.
Labour hold by Jon Cruddas with a majority of 4,980 - 11.6% - on a turnout of 62.3%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| CRUDDAS, Jon | Lab | 17,830 | 41.4% | 1.1% |
| HARRIS, Peter | UKIP | 12,850 | 29.8% | 26.3% |
| MARSON, Julie | Con | 10,492 | 24.4% | -10.0% |
| SIMPSON, Kate | Green | 806 | 1.9% | 1.2% |
| CAPSTICK, Denise | LD | 717 | 1.7% | -6.9% |
| CULNANE, Tess | BNP | 151 | 0.4% | -10.8% |
| LONDON, Terry | Ind | 133 | 0.3% | - |
| GANDY, Kim | ED | 71 | 0.2% | - |
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 69,128, having a valid vote count of 43,050 and an invalid vote count of 83.
Result declared at 03:44 on 8 May 2015.