An election to the 58th Parliament of the United Kingdom for the constituency area of Buckingham, held as part of the general election on 12 December 2019.
Conservative gain from Speaker by Greg Smith with a majority of 20,411 - 32.2% - on a turnout of 76.3%.
Candidates
| Name | Party | Vote | Vote share | Vote change |
| SMITH, Greg | Con | 37,035 | 58.4% | - |
| DORRELL, Stephen | LD | 16,624 | 26.2% | - |
| MORGAN, David | Lab | 7,638 | 12.0% | - |
| BELL, Andrew | BRX | 1,286 | 2.0% | - |
| THOMPSON, Ned | Ind | 681 | 1.1% | - |
| VITIELLO, Antonio | ED | 194 | 0.3% | - |
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 83,146, having a valid vote count of 63,458 and an invalid vote count of 241.
Result declared at 05:42 on 13 December 2019.