| Aberafan Maesteg | Stephen Kinnock | Labour | 7 May 2015 |
| Aberdeen North | Kirsty Blackman | Scottish National Party | 7 May 2015 |
| Aberdeen South | Douglas Lumsden | Conservative | 18 June 2026 |
| Aberdeenshire North and Moray East | Seamus Logan | Scottish National Party | 4 July 2024 |
| Airdrie and Shotts | Kenneth Stevenson | Labour | 4 July 2024 |
| Aldershot | Alex Baker | Labour | 4 July 2024 |
| Aldridge-Brownhills | Wendy Morton | Conservative | 7 May 2015 |
| Alloa and Grangemouth | Brian Leishman | Labour | 4 July 2024 |
| Altrincham and Sale West | Mr Connor Rand | Labour | 4 July 2024 |
| Alyn and Deeside | Sir Mark Tami | Labour | 7 June 2001 |
| Amber Valley | Linsey Farnsworth | Labour | 4 July 2024 |
| Angus and Perthshire Glens | Dave Doogan | Scottish National Party | 12 December 2019 |
| Arbroath and Broughty Ferry | Lara Bird | Scottish National Party | 18 June 2026 |
| Argyll, Bute and South Lochaber | Brendan O'Hara | Scottish National Party | 7 May 2015 |
| Arundel and South Downs | Andrew Griffith | Conservative | 12 December 2019 |
| Ashfield | Lee Anderson | Reform UK | 12 December 2019 |
| Ashford | Sojan Joseph | Labour | 4 July 2024 |
| Ashton-under-Lyne | Angela Rayner | Labour | 7 May 2015 |
| Aylesbury | Laura Kyrke-Smith | Labour | 4 July 2024 |
| Ayr, Carrick and Cumnock | Elaine Stewart | Labour | 4 July 2024 |