| Manchester South West (1885 - 1918) |
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| Mansfield (1885) |
Full name (in Craig 2,3,4) Nottinghamshire, Mansfield |
| Marylebone East (1885 - 1918) |
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| Marylebone West (1885 - 1918) |
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| Mayo East (1885 - 1922) |
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| Mayo North (1885 - 1922) |
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| Mayo South (1885 - 1922) |
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| Mayo West (1885 - 1922) |
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| Meath North (1885 - 1922) |
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| Meath South (1885 - 1922) |
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| Medway (1885 - 2010) |
Full name (in Craig 2) Kent, Medway |
| Melton (1885 - 1983) |
Full name (in Craig 2,3,4) Leicestershire, Melton |
| Middleton (1885 - 1918) |
Full name (in Craig 2) Lancashire, Middleton |
| Monaghan North (1885 - 1922) |
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| Monaghan South (1885 - 1922) |
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| Monmouthshire Northern (1885 - 1918) |
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| Monmouthshire Southern (1885 - 1918) |
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| Monmouthshire Western (1885 - 1918) |
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| Morley (1885 - 1918) |
Full name (in Craig 2) Yorkshire (West Riding), Morley |
| Newbury (1885) |
Full name (in Craig 2,3,4) Berkshire, Newbury |
| New Forest (1885 - 1918) |
Full name (in Craig 2,4) Hampshire, New Forest. Constituency of same name also existed 1950-1997. |
| Newington Walworth (1885 - 1918) |
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| Newington West (1885 - 1918) |
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| Newmarket (1885 - 1918) |
Full name (in Craig 2) Cambridgeshire, Newmarket |
| Newport [Shropshire] (1885 - 1918) |
Full name (in Craig 2) Shropshire, Newport |