| Bolsover | Natalie Fleet | Labour | 4 July 2024 |
| Bolton North East | Kirith Entwistle | Labour | 4 July 2024 |
| Bolton South and Walkden | Yasmin Qureshi | Labour | 6 May 2010 |
| Bolton West | Phil Brickell | Labour | 4 July 2024 |
| Bootle | Peter Dowd | Labour | 7 May 2015 |
| Boston and Skegness | Richard Tice | Reform UK | 4 July 2024 |
| Bournemouth East | Tom Hayes | Labour | 4 July 2024 |
| Bournemouth West | Jessica Toale | Labour | 4 July 2024 |
| Bracknell | Peter Swallow | Labour | 4 July 2024 |
| Bradford East | Imran Hussain | Labour | 7 May 2015 |
| Bradford South | Judith Cummins | Labour | 7 May 2015 |
| Bradford West | Naz Shah | Labour | 7 May 2015 |
| Braintree | Sir James Cleverly | Conservative | 7 May 2015 |
| Brecon, Radnor and Cwm Tawe | David Chadwick | Liberal Democrat | 4 July 2024 |
| Brent East | Dawn Butler | Labour | 7 May 2015 |
| Brent West | Barry Gardiner | Labour | 1 May 1997 |
| Brentford and Isleworth | Ruth Cadbury | Labour | 7 May 2015 |
| Brentwood and Ongar | Alex Burghart | Conservative | 8 June 2017 |
| Bridgend | Chris Elmore | Labour | 5 May 2016 |
| Bridgwater | Sir Ashley Fox | Conservative | 4 July 2024 |
| Bridlington and The Wolds | Charlie Dewhirst | Conservative | 4 July 2024 |
| Brigg and Immingham | Martin Vickers | Conservative | 6 May 2010 |
| Brighton Kemptown and Peacehaven | Chris Ward | Labour | 4 July 2024 |
| Brighton Pavilion | Siân Berry | Green Party | 4 July 2024 |
| Bristol Central | Carla Denyer | Green Party | 4 July 2024 |
| Bristol East | Kerry McCarthy | Labour | 5 May 2005 |
| Bristol North East | Damien Egan | Labour | 15 February 2024 |
| Bristol North West | Darren Jones | Labour | 8 June 2017 |
| Bristol South | Karin Smyth | Labour | 7 May 2015 |
| Broadland and Fakenham | Jerome Mayhew | Conservative | 12 December 2019 |
| Bromley and Biggin Hill | Peter Fortune | Conservative | 4 July 2024 |
| Bromsgrove | Bradley Thomas | Conservative | 4 July 2024 |
| Broxbourne | Lewis Cocking | Conservative | 4 July 2024 |
| Broxtowe | Juliet Campbell | Labour | 4 July 2024 |
| Buckingham and Bletchley | Callum Anderson | Labour | 4 July 2024 |
| Burnley | Oliver Ryan | Labour (Co-op) | 4 July 2024 |
| Burton and Uttoxeter | Jacob Collier | Labour | 4 July 2024 |
| Bury North | Mr James Frith | Labour | 4 July 2024 |
| Bury South | Christian Wakeford | Labour | 12 December 2019 |
| Bury St Edmunds and Stowmarket | Dr Peter Prinsley | Labour | 4 July 2024 |
| Caerfyrddin | Ann Davies | Plaid Cymru | 4 July 2024 |
| Caerphilly | Chris Evans | Labour (Co-op) | 6 May 2010 |
| Caithness, Sutherland and Easter Ross | Jamie Stone | Liberal Democrat | 8 June 2017 |
| Calder Valley | Josh Fenton-Glynn | Labour | 4 July 2024 |
| Camborne and Redruth | Perran Moon | Independent | 4 July 2024 |
| Cambridge | Daniel Zeichner | Labour | 7 May 2015 |
| Cannock Chase | Josh Newbury | Labour | 4 July 2024 |
| Canterbury | Rosie Duffield | Independent | 8 June 2017 |
| Cardiff East | Jo Stevens | Labour | 7 May 2015 |
| Cardiff North | Anna McMorrin | Labour | 8 June 2017 |
| Cardiff South and Penarth | Stephen Doughty | Labour (Co-op) | 15 November 2012 |
| Cardiff West | Mr Alex Barros-Curtis | Labour | 4 July 2024 |
| Carlisle | Ms Julie Minns | Labour | 4 July 2024 |
| Carshalton and Wallington | Bobby Dean | Liberal Democrat | 4 July 2024 |
| Castle Point | Rebecca Harris | Conservative | 6 May 2010 |
| Central Ayrshire | Alan Gemmell | Labour | 4 July 2024 |
| Central Devon | Sir Mel Stride | Conservative | 6 May 2010 |
| Central Suffolk and North Ipswich | Patrick Spencer | Conservative | 4 July 2024 |
| Ceredigion Preseli | Ben Lake | Plaid Cymru | 8 June 2017 |
| Chatham and Aylesford | Tristan Osborne | Labour | 4 July 2024 |
| Cheadle | Tom Morrison | Liberal Democrat | 4 July 2024 |
| Chelmsford | Marie Goldman | Liberal Democrat | 4 July 2024 |
| Chelsea and Fulham | Ben Coleman | Labour | 4 July 2024 |
| Cheltenham | Max Wilkinson | Liberal Democrat | 4 July 2024 |
| Chesham and Amersham | Sarah Green | Liberal Democrat | 17 June 2021 |