An election to the 56th Parliament of the United Kingdom for the constituency area of Lincoln, held as part of the general election on 7 May 2015.
Conservative hold by Karl McCartney with a majority of 1,443 - 3.1% - on a turnout of 63.2%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| MCCARTNEY, Karl | Con | 19,976 | 42.6% | 5.1% |
| RIGBY, Lucy | Lab | 18,533 | 39.6% | 4.3% |
| SMITH, Nick | UKIP | 5,721 | 12.2% | 10.0% |
| PEPPER, Ross | LD | 1,992 | 4.3% | -16.0% |
| SMITH, Elaine | TUSC | 344 | 0.7% | - |
| POWELL, Helen | LNIN | 286 | 0.6% | - |
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 74,121, having a valid vote count of 46,852 and an invalid vote count of 224.
Result declared at 04:48 on 8 May 2015.