| Banbury | Sean Woodcock | Labour | 4 July 2024 |
| Bangor Aberconwy | Claire Hughes | Labour | 4 July 2024 |
| Barking | Nesil Caliskan | Labour | 4 July 2024 |
| Barnsley North | Dan Jarvis | Labour | 3 March 2011 |
| Barnsley South | Stephanie Peacock | Labour | 8 June 2017 |
| Barrow and Furness | Michelle Scrogham | Labour | 4 July 2024 |
| Basildon and Billericay | Mr Richard Holden | Conservative | 12 December 2019 |
| Basingstoke | Luke Murphy | Labour | 4 July 2024 |
| Bassetlaw | Jo White | Labour | 4 July 2024 |
| Bath | Wera Hobhouse | Liberal Democrat | 8 June 2017 |
| Bathgate and Linlithgow | Kirsteen Sullivan | Labour (Co-op) | 4 July 2024 |
| Battersea | Marsha De Cordova | Labour | 8 June 2017 |
| Beaconsfield | Joy Morrissey | Conservative | 12 December 2019 |
| Beckenham and Penge | Liam Conlon | Labour | 4 July 2024 |
| Bedford | Mohammad Yasin | Labour | 8 June 2017 |
| Belfast East | Gavin Robinson | Democratic Unionist Party | 7 May 2015 |
| Belfast North | John Finucane | Sinn Féin | 12 December 2019 |
| Belfast South and Mid Down | Claire Hanna | Social Democratic & Labour Party | 12 December 2019 |
| Belfast West | Paul Maskey | Sinn Féin | 9 June 2011 |
| Bermondsey and Old Southwark | Neil Coyle | Labour | 7 May 2015 |
| Berwickshire, Roxburgh and Selkirk | John Lamont | Conservative | 8 June 2017 |
| Bethnal Green and Stepney | Rushanara Ali | Labour | 6 May 2010 |
| Beverley and Holderness | Graham Stuart | Conservative | 5 May 2005 |
| Bexhill and Battle | Dr Kieran Mullan | Conservative | 12 December 2019 |
| Bexleyheath and Crayford | Daniel Francis | Labour | 4 July 2024 |
| Bicester and Woodstock | Calum Miller | Liberal Democrat | 4 July 2024 |
| Birkenhead | Alison McGovern | Labour | 6 May 2010 |
| Birmingham Edgbaston | Preet Kaur Gill | Labour (Co-op) | 8 June 2017 |
| Birmingham Erdington | Paulette Hamilton | Labour | 3 March 2022 |
| Birmingham Hall Green and Moseley | Tahir Ali | Labour | 12 December 2019 |
| Birmingham Hodge Hill and Solihull North | Liam Byrne | Labour | 15 July 2004 |
| Birmingham Ladywood | Shabana Mahmood | Labour | 6 May 2010 |
| Birmingham Northfield | Laurence Turner | Labour | 4 July 2024 |
| Birmingham Perry Barr | Ayoub Khan | Independent | 4 July 2024 |
| Birmingham Selly Oak | Al Carns | Labour | 4 July 2024 |
| Birmingham Yardley | Jess Phillips | Labour | 7 May 2015 |
| Bishop Auckland | Dr Sam Rushworth | Labour | 4 July 2024 |
| Blackburn | Mr Adnan Hussain | Independent | 4 July 2024 |
| Blackley and Middleton South | Graham Stringer | Labour | 1 May 1997 |
| Blackpool North and Fleetwood | Lorraine Beavers | Labour | 4 July 2024 |
| Blackpool South | Chris Webb | Labour | 2 May 2024 |
| Blaenau Gwent and Rhymney | Nick Smith | Labour | 6 May 2010 |
| Blaydon and Consett | Liz Twist | Labour | 8 June 2017 |
| Blyth and Ashington | Ian Lavery | Labour | 6 May 2010 |
| Bognor Regis and Littlehampton | Alison Griffiths | Conservative | 4 July 2024 |
| 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 |