- Na h-Eileanan an Iar 2005-
- Nantwich 1950-1983
- National University 1918-1922
- Neath 1918-
- Nelson and Colne 1918-1983
- New Forest 1950-1997
- New Forest 1885-1918
- New Forest East 1997-
- New Forest West 1997-
- New Forest and Christchurch 1918-1950
- New Romney 1660-1832
- New Ross 1802-1885
- Newark-on-Trent 1673-
- Newbury 1885-
- Newcastle upon Tyne 1832-1918
- Newcastle upon Tyne Central 1918-
- Newcastle upon Tyne East 1918-1997
- Newcastle upon Tyne East and Wallsend 1997-
- Newcastle upon Tyne North 1918-
- Newcastle upon Tyne West 1918-1983
- Newcastle-under-Lyme 1660-
- Newham North East 1974-1997
- Newham North West 1974-1997
- Newham South 1974-1997
- Newington Walworth 1885-1918
- Newington West 1885-1918
- Newmarket 1885-1918
- Newport 1885-1918
- Newport 1660-1832
- Newport 1660-1885
- Newport 1918-1983
- Newport East 1983-
- Newport West 1983-
- Newry 1802-1918
- Newry and Armagh 1983-
- Newton 1885-1983
- Newton 1660-1832
- Newtown 1660-1832
- Norfolk 1660-1832
- Norfolk Central 1950-1974
- Norfolk Eastern 1885-1950
- Norfolk Eastern 1832-1868
- Norfolk Mid 1983-
- Norfolk Mid 1885-1918
- Norfolk North 1950-
- Norfolk North West 1974-
- Norfolk North Western 1885-1918
- Norfolk Northern 1868-1950
- Norfolk South 1950-
- Norfolk South West 1950-
- Norfolk South Western 1885-1950
- Norfolk Southern 1868-1950
- Norfolk Western 1832-1885
- Normanton 1885-
- North Angus and Mearns 1950-1974
- North Fylde 1950-1983
- North Lonsdale 1885-1918
- Northallerton 1660-1885
- Northampton 1660-1974
- Northampton North 1974-
- Northampton South 1974-
- Northamptonshire 1660-1832
- Northamptonshire Eastern 1885-1918
- Northamptonshire Mid 1885-1918
- Northamptonshire Northern 1832-1918
- Northamptonshire South 1950-1974
- Northamptonshire Southern 1832-1918
- Northavon 1983-
- Northumberland 1659-1832
- Northumberland Northern 1832-1885
- Northumberland Southern 1832-1885
- Northwich 1885-1983
- Norwich 1660-1950
- Norwich North 1950-
- Norwich South 1950-
- Norwood 1983-1997
- Nottingham 1660-1885
- Nottingham Central 1918-1974
- Nottingham East 1885-1955
- Nottingham East 1974-
- Nottingham North 1955-
- Nottingham North West 1950-1955
- Nottingham South 1885-1974
- Nottingham South 1983-
- Nottingham West 1955-1983
- Nottingham West 1885-1950
- Nottinghamshire 1660-1832
- Nottinghamshire Northern 1832-1885
- Nottinghamshire Southern 1832-1885
- Nuneaton 1885-
2,145 constituencies in total