| Plymouth Sutton and Devonport | Luke Pollard | Labour (Co-op) | 8 June 2017 |
| Pontefract, Castleford and Knottingley | Yvette Cooper | Labour | 1 May 1997 |
| Pontypridd | Alex Davies-Jones | Labour | 12 December 2019 |
| Poole | Neil Duncan-Jordan | Labour | 4 July 2024 |
| Poplar and Limehouse | Apsana Begum | Labour | 12 December 2019 |
| Portsmouth North | Amanda Martin | Labour | 4 July 2024 |
| Portsmouth South | Stephen Morgan | Labour | 8 June 2017 |
| Preston | Sir Mark Hendrick | Labour (Co-op) | 23 November 2000 |
| Putney | Fleur Anderson | Labour | 12 December 2019 |
| Queen's Park and Maida Vale | Georgia Gould | Labour | 4 July 2024 |
| Rawmarsh and Conisbrough | John Healey | Labour | 1 May 1997 |
| Rayleigh and Wickford | Mr Mark Francois | Conservative | 7 June 2001 |
| Reading Central | Matt Rodda | Labour | 8 June 2017 |
| Reading West and Mid Berkshire | Olivia Bailey | Labour | 4 July 2024 |
| Redcar | Anna Turley | Labour (Co-op) | 4 July 2024 |
| Redditch | Chris Bloore | Labour | 4 July 2024 |
| Reigate | Rebecca Paul | Conservative | 4 July 2024 |
| Rhondda and Ogmore | Chris Bryant | Labour | 7 June 2001 |
| Ribble Valley | Maya Ellis | Labour | 4 July 2024 |
| Richmond and Northallerton | Rishi Sunak | Conservative | 7 May 2015 |
| Richmond Park | Sarah Olney | Liberal Democrat | 12 December 2019 |
| Rochdale | Paul Waugh | Labour (Co-op) | 4 July 2024 |
| Rochester and Strood | Lauren Edwards | Labour | 4 July 2024 |
| Romford | Andrew Rosindell | Reform UK | 7 June 2001 |
| Romsey and Southampton North | Caroline Nokes | Conservative | 6 May 2010 |
| Rossendale and Darwen | Andy MacNae | Labour | 4 July 2024 |
| Rother Valley | Jake Richards | Labour | 4 July 2024 |
| Rotherham | Sarah Champion | Labour | 29 November 2012 |
| Rugby | John Slinger | Labour | 4 July 2024 |
| Ruislip, Northwood and Pinner | David Simmonds | Conservative | 12 December 2019 |
| Runcorn and Helsby | Sarah Pochin | Reform UK | 1 May 2025 |
| Runnymede and Weybridge | Dr Ben Spencer | Conservative | 12 December 2019 |
| Rushcliffe | James Naish | Labour | 4 July 2024 |
| Rutherglen | Michael Shanks | Labour | 5 October 2023 |
| Rutland and Stamford | Alicia Kearns | Conservative | 12 December 2019 |
| Salford | Rebecca Long Bailey | Labour | 7 May 2015 |
| Salisbury | John Glen | Conservative | 6 May 2010 |
| Scarborough and Whitby | Alison Hume | Labour | 4 July 2024 |
| Scunthorpe | Sir Nicholas Dakin | Labour | 4 July 2024 |
| Sefton Central | Bill Esterson | Labour | 6 May 2010 |
| Selby | Keir Mather | Labour | 20 July 2023 |
| Sevenoaks | Laura Trott | Conservative | 12 December 2019 |
| Sheffield Brightside and Hillsborough | Gill Furniss | Labour | 5 May 2016 |
| Sheffield Central | Abtisam Mohamed | Labour | 4 July 2024 |
| Sheffield Hallam | Olivia Blake | Labour | 12 December 2019 |
| Sheffield Heeley | Louise Haigh | Labour | 7 May 2015 |
| Sheffield South East | Mr Clive Betts | Labour | 9 April 1992 |
| Sherwood Forest | Michelle Welsh | Labour | 4 July 2024 |
| Shipley | Anna Dixon | Labour | 4 July 2024 |
| Shrewsbury | Julia Buckley | Labour | 4 July 2024 |
| Sittingbourne and Sheppey | Kevin McKenna | Labour | 4 July 2024 |
| Skipton and Ripon | Sir Julian Smith | Conservative | 6 May 2010 |
| Sleaford and North Hykeham | Dr Caroline Johnson | Conservative | 8 December 2016 |
| Slough | Mr Tanmanjeet Singh Dhesi | Labour | 8 June 2017 |
| Smethwick | Gurinder Singh Josan | Labour | 4 July 2024 |
| Solihull West and Shirley | Dr Neil Shastri-Hurst | Conservative | 4 July 2024 |
| South Antrim | Robin Swann | Ulster Unionist Party | 4 July 2024 |
| South Basildon and East Thurrock | James McMurdock | Independent | 4 July 2024 |
| South Cambridgeshire | Pippa Heylings | Liberal Democrat | 4 July 2024 |
| South Cotswolds | Dr Roz Savage | Liberal Democrat | 4 July 2024 |
| South Derbyshire | Samantha Niblett | Labour | 4 July 2024 |
| South Devon | Caroline Voaden | Liberal Democrat | 4 July 2024 |
| South Dorset | Lloyd Hatton | Labour | 4 July 2024 |
| South Down | Chris Hazzard | Sinn Féin | 8 June 2017 |
| South East Cornwall | Anna Gelderd | Labour | 4 July 2024 |