An election to the 56th Parliament of the United Kingdom for the constituency area of Lewes, held as part of the general election on 7 May 2015.
Conservative gain from Liberal Democrats by Maria Caulfield with a majority of 1,083 - 2.1% - on a turnout of 72.7%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| CAULFIELD, Maria | Con | 19,206 | 38.0% | 1.3% |
| BAKER, Norman | LD | 18,123 | 35.9% | -16.1% |
| FINCH, Ray | UKIP | 5,427 | 10.7% | 7.3% |
| RUSSELL-MOYLE, Lloyd | Lab | 5,000 | 9.9% | 4.9% |
| STIRLING, Alfie | Green | 2,784 | 5.5% | 4.1% |
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 69,481, having a valid vote count of 50,540 and an invalid vote count of 191.
Result declared at 06:25 on 8 May 2015.