| Portsmouth South | Stephen Morgan | 8 June 2017 |
| Putney | Fleur Anderson | 12 December 2019 |
| Queen's Park and Maida Vale | Georgia Gould | 4 July 2024 |
| Rawmarsh and Conisbrough | John Healey | 1 May 1997 |
| Reading Central | Matt Rodda | 8 June 2017 |
| Reading West and Mid Berkshire | Olivia Bailey | 4 July 2024 |
| Redditch | Chris Bloore | 4 July 2024 |
| Rhondda and Ogmore | Chris Bryant | 7 June 2001 |
| Ribble Valley | Maya Ellis | 4 July 2024 |
| Rochester and Strood | Lauren Edwards | 4 July 2024 |
| Rossendale and Darwen | Andy MacNae | 4 July 2024 |
| Rother Valley | Jake Richards | 4 July 2024 |
| Rotherham | Sarah Champion | 29 November 2012 |
| Rugby | John Slinger | 4 July 2024 |
| Rushcliffe | James Naish | 4 July 2024 |
| Rutherglen | Michael Shanks | 5 October 2023 |
| Salford | Rebecca Long Bailey | 7 May 2015 |
| Scarborough and Whitby | Alison Hume | 4 July 2024 |
| Scunthorpe | Sir Nicholas Dakin | 4 July 2024 |
| Sefton Central | Bill Esterson | 6 May 2010 |
| Selby | Keir Mather | 20 July 2023 |
| Sheffield Brightside and Hillsborough | Gill Furniss | 5 May 2016 |
| Sheffield Central | Abtisam Mohamed | 4 July 2024 |
| Sheffield Hallam | Olivia Blake | 12 December 2019 |
| Sheffield Heeley | Louise Haigh | 7 May 2015 |
| Sheffield South East | Mr Clive Betts | 9 April 1992 |
| Sherwood Forest | Michelle Welsh | 4 July 2024 |
| Shipley | Anna Dixon | 4 July 2024 |
| Shrewsbury | Julia Buckley | 4 July 2024 |
| Sittingbourne and Sheppey | Kevin McKenna | 4 July 2024 |
| Slough | Mr Tanmanjeet Singh Dhesi | 8 June 2017 |
| Smethwick | Gurinder Singh Josan | 4 July 2024 |
| South Derbyshire | Samantha Niblett | 4 July 2024 |
| South Dorset | Lloyd Hatton | 4 July 2024 |
| South East Cornwall | Anna Gelderd | 4 July 2024 |
| South Norfolk | Ben Goldsborough | 4 July 2024 |
| South Ribble | Mr Paul Foster | 4 July 2024 |
| South Shields | Emma Lewell | 2 May 2013 |
| South West Norfolk | Terry Jermy | 4 July 2024 |
| Southampton Itchen | Darren Paffey | 4 July 2024 |
| Southampton Test | Satvir Kaur | 4 July 2024 |
| Southend West and Leigh | David Burton-Sampson | 4 July 2024 |
| Southgate and Wood Green | Bambos Charalambous | 8 June 2017 |
| Southport | Patrick Hurley | 4 July 2024 |
| Spen Valley | Kim Leadbeater | 1 July 2021 |
| St Austell and Newquay | Noah Law | 4 July 2024 |
| St Helens North | David Baines | 4 July 2024 |
| St Helens South and Whiston | Ms Marie Rimmer | 7 May 2015 |
| Stafford | Leigh Ingham | 4 July 2024 |
| Stevenage | Kevin Bonavia | 4 July 2024 |
| Stirling and Strathallan | Chris Kane | 4 July 2024 |
| Stockport | Navendu Mishra | 12 December 2019 |
| Stockton North | Chris McDonald | 4 July 2024 |
| Stoke-on-Trent North | David Williams | 4 July 2024 |
| Stoke-on-Trent South | Dr Allison Gardner | 4 July 2024 |
| Stourbridge | Cat Eccles | 4 July 2024 |
| Stratford and Bow | Uma Kumaran | 4 July 2024 |
| Stretford and Urmston | Andrew Western | 15 December 2022 |
| Stroud | Dr Simon Opher | 4 July 2024 |
| Suffolk Coastal | Jenny Riddell-Carpenter | 4 July 2024 |
| Sunderland Central | Lewis Atkinson | 4 July 2024 |
| Swansea West | Torsten Bell | 4 July 2024 |
| Swindon North | Will Stone | 4 July 2024 |
| Swindon South | Heidi Alexander | 4 July 2024 |
| Tamworth | Sarah Edwards | 19 October 2023 |