| Halifax | Kate Dearden | Labour (Co-op) | 4 July 2024 |
| Hamble Valley | Paul Holmes | Conservative | 12 December 2019 |
| Hamilton and Clyde Valley | Imogen Walker | Labour | 4 July 2024 |
| Hammersmith and Chiswick | Andy Slaughter | Labour | 5 May 2005 |
| Hampstead and Highgate | Tulip Siddiq | Labour | 7 May 2015 |
| Harborough, Oadby and Wigston | Neil O'Brien | Conservative | 8 June 2017 |
| Harlow | Chris Vince | Labour (Co-op) | 4 July 2024 |
| Harpenden and Berkhamsted | Victoria Collins | Liberal Democrat | 4 July 2024 |
| Harrogate and Knaresborough | Tom Gordon | Liberal Democrat | 4 July 2024 |
| Harrow East | Bob Blackman | Conservative | 6 May 2010 |
| Harrow West | Gareth Thomas | Labour (Co-op) | 1 May 1997 |
| Hartlepool | Mr Jonathan Brash | Labour | 4 July 2024 |
| Harwich and North Essex | Sir Bernard Jenkin | Conservative | 9 April 1992 |
| Hastings and Rye | Helena Dollimore | Labour (Co-op) | 4 July 2024 |
| Havant | Alan Mak | Conservative | 7 May 2015 |
| Hayes and Harlington | John McDonnell | Labour | 1 May 1997 |
| Hazel Grove | Lisa Smart | Liberal Democrat | 4 July 2024 |
| Hemel Hempstead | David Taylor | Labour | 4 July 2024 |
| Hendon | David Pinto-Duschinsky | Labour | 4 July 2024 |
| Henley and Thame | Freddie van Mierlo | Liberal Democrat | 4 July 2024 |
| Hereford and South Herefordshire | Jesse Norman | Conservative | 6 May 2010 |
| Herne Bay and Sandwich | Sir Roger Gale | Conservative | 9 June 1983 |
| Hertford and Stortford | Josh Dean | Labour | 4 July 2024 |
| Hertsmere | Sir Oliver Dowden | Conservative | 7 May 2015 |
| Hexham | Joe Morris | Labour | 4 July 2024 |
| Heywood and Middleton North | Mrs Elsie Blundell | Labour | 4 July 2024 |
| High Peak | Jon Pearce | Labour | 4 July 2024 |
| Hinckley and Bosworth | Dr Luke Evans | Conservative | 12 December 2019 |
| Hitchin | Alistair Strathern | Labour | 19 October 2023 |
| Holborn and St Pancras | Sagal Abdi-Wali | Labour | 8 October 2026 |
| Honiton and Sidmouth | Richard Foord | Liberal Democrat | 23 June 2022 |
| Hornchurch and Upminster | Julia Lopez | Conservative | 8 June 2017 |
| Hornsey and Friern Barnet | Catherine West | Labour | 7 May 2015 |
| Horsham | John Milne | Liberal Democrat | 4 July 2024 |
| Houghton and Sunderland South | Bridget Phillipson | Labour | 6 May 2010 |
| Hove and Portslade | Peter Kyle | Labour | 7 May 2015 |
| Huddersfield | Harpreet Uppal | Labour | 4 July 2024 |
| Huntingdon | Ben Obese-Jecty | Conservative | 4 July 2024 |
| Hyndburn | Sarah Smith | Labour | 4 July 2024 |
| Ilford North | Wes Streeting | Labour | 7 May 2015 |
| Ilford South | Jas Athwal | Labour | 4 July 2024 |
| Inverclyde and Renfrewshire West | Martin McCluskey | Labour | 4 July 2024 |
| Inverness, Skye and West Ross-shire | Mr Angus MacDonald | Liberal Democrat | 4 July 2024 |
| Ipswich | Jack Abbott | Labour (Co-op) | 4 July 2024 |
| Isle of Wight East | Joe Robertson | Conservative | 4 July 2024 |
| Isle of Wight West | Richard Quigley | Labour | 4 July 2024 |
| Islington North | Jeremy Corbyn | Your Party | 9 June 1983 |
| Islington South and Finsbury | Emily Thornberry | Labour | 5 May 2005 |
| Jarrow and Gateshead East | Kate Osborne | Labour | 12 December 2019 |
| Keighley and Ilkley | Robbie Moore | Conservative | 12 December 2019 |
| Kenilworth and Southam | Sir Jeremy Wright | Conservative | 5 May 2005 |
| Kensington and Bayswater | Joe Powell | Labour | 4 July 2024 |
| Kettering | Rosie Wrighting | Labour | 4 July 2024 |
| Kilmarnock and Loudoun | Lillian Jones | Labour | 4 July 2024 |
| Kingston and Surbiton | Ed Davey | Liberal Democrat | 8 June 2017 |
| Kingston upon Hull East | Karl Turner | Labour | 6 May 2010 |
| Kingston upon Hull North and Cottingham | Dame Diana Johnson | Labour | 5 May 2005 |
| Kingston upon Hull West and Haltemprice | Emma Hardy | Labour | 8 June 2017 |
| Kingswinford and South Staffordshire | Mike Wood | Conservative | 7 May 2015 |
| Knowsley | Anneliese Midgley | Labour | 4 July 2024 |
| Lagan Valley | Sorcha Eastwood | Alliance | 4 July 2024 |
| Lancaster and Wyre | Cat Smith | Labour | 7 May 2015 |
| Leeds Central and Headingley | Alex Sobel | Labour (Co-op) | 8 June 2017 |
| Leeds East | Richard Burgon | Labour | 7 May 2015 |
| Leeds North East | Fabian Hamilton | Labour | 1 May 1997 |