| Monmouthshire |
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| Monmouthshire |
Welsh name: Sir Fynwy. |
| Monmouthshire Northern |
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| Monmouthshire Southern |
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| Monmouthshire Western |
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| Montgomery |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Montgomery District of Boroughs |
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| Montgomeryshire |
Constituency of same name also existed 1832-1974¹. |
| Montgomeryshire |
Constituency first used at the February General election of 1974 (28/02/1974). Constituency of same name reformed 1997. |
| Montgomeryshire and Glyndŵr |
Welsh name: Maldwyn a Glyndŵr. |
| Montrose District of Burghs |
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| Moray |
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| Moray and Nairn |
Constituency first used at the February General election of 1974 (28/02/1974). Probably not a true founding in 1974 - may be simply a difference of nomenclature between Craig and Times HoC sources. See also Moray and Nairnshire (1918-1974¹). |
| Moray and Nairnshire |
Constituency first used at the February General election of 1974 (28/02/1974). Probably not a true disbandment in 1974 - may be simply a difference of nomenclature between Craig and Times HoC sources. See also Moray and Nairn (1974¹-1983). |
| Moray West, Nairn and Strathspey |
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| Morecambe and Lonsdale |
Full name (in Craig 4) Lancashire, Morecambe and Lonsdale |
| Morecambe and Lunesdale |
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| Morley |
Full name (in Craig 2) Yorkshire (West Riding), Morley |
| Morley and Outwood |
Succeeds Morley and Rothwell. It consists of the town of Morley, in the City of Leeds metropolitan district, and around Outwood in the City of Wakefield district |
| Morley and Rothwell |
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| Morpeth |
Full name (in Craig 4) Northumberland, Morpeth |
| Mossley |
Full name (in Craig 3) Lancashire, Mossley |
| Motherwell |
Constituency first used at the February General election of 1974 (28/02/1974). Full name (in Craig 3,4) Lanarkshire, Motherwell |
| Motherwell and Wishaw |
Constituency first used at the February General election of 1974 (28/02/1974). |
| Motherwell North |
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