1983
| Constituency | Notes |
|---|---|
| Makerfield (1983) | |
| Meirionnydd Nant Conwy (1983 - 2010) | |
| Merthyr Tydfil and Rhymney (1983 - 2024) | |
| Middlesbrough (1983 - 2024) | Seat of same name existed 1832-1918. |
| Milton Keynes (1983 - 1992) | |
| Mitcham and Morden (1983) | |
| Mole Valley (1983 - 2024) | |
| Monklands East (1983 - 1997) | |
| Monklands West (1983 - 1997) | |
| Moray (1983 - 2024) | |
| Morecambe and Lunesdale (1983) | |
| Motherwell North (1983 - 1997) | |
| Motherwell South (1983 - 1997) | |
| Newport East (1983) | |
| Newport West (1983 - 2024) | |
| Newry and Armagh (1983) | |
| Norfolk Mid (1983) | Constituency of same name also existed 1885-1918. |
| Northavon (1983 - 2010) | |
| Norwood (1983 - 1997) | |
| Nottingham South (1983) | Constituency of same name also existed 1885-1974¹. |
| Old Bexley and Sidcup (1983) | |
| Oldham Central and Royton (1983 - 1997) | |
| Orpington (1983) | Constituency of same name also existed 1918-1974¹. |
| Oxford East (1983) | |
| Oxford West and Abingdon (1983) |