- Hackney 1832-1885
- Hackney Central 1885-1983
- Hackney North 1885-1950
- Hackney North and Stoke Newington 1974-
- Hackney South 1885-1974
- Hackney South and Shoreditch 1974-
- Haddington District of Burghs 1708-1885
- Haddingtonshire 1708-1918
- Halesowen and Rowley Regis 1997-
- Halesowen and Stourbridge 1974-1997
- Halifax 1832-
- Hallamshire 1885-1918
- Haltemprice 1955-1983
- Haltemprice and Howden 1997-
- Halton 1983-
- Hamilton 1918-1997
- Hamilton North and Bellshill 1997-2005
- Hamilton South 1997-2005
- Hammersmith 1885-1918
- Hammersmith 1983-1997
- Hammersmith Fulham 1974-1983
- Hammersmith North 1918-1983
- Hammersmith South 1918-1955
- Hammersmith and Fulham 1997-
- Hampshire 1660-1832
- Hampshire East 1983-
- Hampshire North East 1997-
- Hampshire North West 1983-
- Hampshire Northern 1832-1885
- Hampshire Southern 1832-1885
- Hampstead 1885-1974
- Hampstead and Highgate 1983-
- Handsworth 1885-1918
- Hanley 1885-1918
- Harborough 1885-
- Haringey Hornsey 1974-1983
- Haringey Tottenham 1974-1983
- Haringey Wood Green 1974-1983
- Harlow 1974-
- Harrogate 1950-1997
- Harrogate and Knaresborough 1997-
- Harrow 1885-1945
- Harrow Central 1950-1983
- Harrow East 1945-
- Harrow West 1945-
- Hartlepool 1974-
- Hartlepools, The 1868-1974
- Harwich 1660-
- Haslemere 1660-1832
- Hastings 1660-1983
- Hastings and Rye 1983-
- Havant 1983-
- Havant and Waterloo 1974-1983
- Haverfordwest District of Boroughs 1660-1885
- Havering Hornchurch 1974-1983
- Havering Upminster 1974-1983
- Hawick District of Burghs 1832-1918
- Hayes and Harlington 1950-1974
- Hayes and Harlington 1983-
- Hazel Grove 1974-
- Hedon 1660-1832
- Helston 1660-1885
- Hemel Hempstead 1918-1983
- Hemel Hempstead 1997-
- Hemsworth 1918-
- Hendon 1997-
- Hendon 1918-1945
- Hendon North 1945-1974
- Hendon North 1983-1997
- Hendon South 1983-1997
- Hendon South 1945-1974
- Henley 1885-
- Hereford 1660-
- Herefordshire 1660-1885
- Hertford 1660-1974
- Hertford and Stevenage 1974-1983
- Hertford and Stortford 1983-
- Hertfordshire 1660-1885
- Hertfordshire East 1955-1983
- Hertfordshire North 1983-1997
- Hertfordshire North East 1997-
- Hertfordshire South 1974-1983
- Hertfordshire South West 1950-
- Hertfordshire West 1983-1997
- Hertsmere 1983-
- Heston and Isleworth 1918-1974
- Hexham 1885-
- Heytesbury 1660-1832
- Heywood 1885-1918
- Heywood and Middleton 1983-
- Heywood and Radcliffe 1918-1950
- Heywood and Royton 1950-1983
- High Peak 1885-
- Higham Ferrers 1660-1832
- Hillingdon Hayes and Harlington 1974-1983
- Hillingdon Ruislip Northwood 1974-1983
- Hillingdon Uxbridge 1974-1983
- Hindon 1660-1832
- Hitchin 1885-1983
- Hitchin and Harpenden 1997-
- Holborn 1918-1950
- Holborn and St Pancras 1983-
- Holborn and St Pancras South 1950-1974
- Holderness 1885-1950
- Holland with Boston 1918-1997
- Holmfirth 1885-1918
- Honiton 1660-1868
- Honiton 1885-1997
- Horncastle 1885-1983
- Hornchurch 1918-
- Hornsey 1885-1974
- Hornsey and Wood Green 1983-
- Horsham 1945-1974
- Horsham 1983-
- Horsham 1660-1918
- Horsham and Crawley 1974-1983
- Horsham and Worthing 1918-1945
- Houghton and Washington 1983-1997
- Houghton and Washington East 1997-
- Houghton-le-Spring 1885-1983
- Hounslow Brentford and Isleworth 1974-1983
- Hounslow Feltham and Heston 1974-1983
- Hove 1950-
- Howden 1950-1983
- Howdenshire 1885-1950
- Huddersfield 1832-1950
- Huddersfield 1983-
- Huddersfield East 1950-1983
- Huddersfield West 1950-1983
- Huntingdon 1983-
- Huntingdon 1660-1918
- Huntingdonshire 1918-1983
- Huntingdonshire 1660-1885
- Huyton 1950-1983
- Hyde 1885-1918
- Hyndburn 1983-
- Hythe 1660-1950
2,145 constituencies in total