An election to the 56th Parliament of the United Kingdom for the constituency area of Old Bexley and Sidcup, held as part of the general election on 7 May 2015.
Conservative hold by James Brokenshire with a majority of 15,803 - 33.8% - on a turnout of 70.8%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| BROKENSHIRE, James | Con | 24,682 | 52.8% | -1.3% |
| MEHMET, Ibby | Lab | 8,879 | 19.0% | -0.3% |
| REILLY, Catherine | UKIP | 8,528 | 18.2% | 14.9% |
| KEEN, Jennifer | LD | 1,644 | 3.5% | -11.9% |
| MORAN, Derek | Green | 1,336 | 2.9% | 2.0% |
| GILL, Bob | NHAP | 1,216 | 2.6% | - |
| WILLIAMS, Laurence | CHP | 245 | 0.5% | - |
| FINCH, Nicola | BNP | 218 | 0.5% | -4.2% |
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 66,035, having a valid vote count of 46,748 and an invalid vote count of 105.
Result declared at 04:34 on 8 May 2015.