Twin Towns in the UK
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| UK town | UK region | Overseas town/region | Overseas country |
| Macclesfield | Cheshire | Eckernforde | Germany |
| Machen | Newport | Sautron | France |
| Machynlleth | Powys | Belleville | USA |
| Maidstone | Kent | Beauvais | France |
| Maldon | Essex | Cuijk | Netherlands |
| Maldon | Essex | Villeparisis | France |
| Malling | Kent | Auchel | France |
| Malmesbury | Wiltshire | Gien | |
| Malmesbury | Wiltshire | Niebull | Germany |
| Malpas | Cheshire | Questembert | France |
| Manchester | Greater Manchester | Amsterdam | Netherlands |
| Manchester | Greater Manchester | Chemnitz | Germany |
| Manchester | Greater Manchester | Cordoba | Spain |
| Manchester | Greater Manchester | Faisalabad | Pakistan |
| Manchester | Greater Manchester | Puerto Cabazas | Nicaragua |
| Manchester | Greater Manchester | Rehovot | Israel |
| Manchester | Greater Manchester | St Petersburg | Russia |
| Manchester | Greater Manchester | Wuhan | China |
| Manningtree | Essex | Frankenberg/Eder | Germany |
| Manorbier | Pembrokeshire | Vernou-La-Celle-Sur-Seine | France |
| Mansfield | Nottinghamshire | Heiligenhaus | Germany |
| Mansfield | Nottinghamshire | Mansfield | USA |
| Mansfield | Nottinghamshire | Stryv | Ukraine |
| March | Cambridgeshire | St-Jean-De-Braye | France |
| Marchington | Staffordshire | Neudrossenfeld | Germany |
| Marchwood | Hampshire | St Contest | France |
| Margate | Kent | Idar Oberstein | Germany |
| Margate | Kent | Les Mureaux | France |
| Margate | Kent | Margate City | USA |
| Margate | Kent | Margate | South Africa |
| Margate | Kent | Yalta | Ukraine |
| Market Drayton | Shropshire | Pezenas | France |
| Market Rasen | Lincolnshire | Mamers | France |
| Marlborough | Wiltshire | Marlborough | USA |
| Marlow | Buckinghamshire | Marly-Le-Roi | France |
| Mary Tavy | Devon | Mery-Corbon | France |
| Mathry | Pembrokeshire | Champagne-Vigny | France |
| Matlock | Derbyshire | Eaubonne | France |
| Maybole | South Ayrshire | Beloeil | Belgium |
| Maybole | South Ayrshire | Schotten | Germany |
| Maybole | South Ayrshire | Crosne | France |
| Melksham | Wiltshire | Avon | France |
| Melksham | Wiltshire | Marienhafe | Germany |
| Melton | Leicestershire | Sochaczew | Poland |
| Melton Mowbray | Leicestershire | Kapelle | Netherlands |
| Mendip | Somerset | Svetlogorsk | Belarus |
| Meopham | Kent | Valkenisse | Netherlands |
| Merthyr Tydfil | Merthyr Tydfil | Clichy | France |
| Merton | London | Irving | USA |
| Michelmersh & Timsbury | Hampshire | Ryes | France |
| Middleham | North Yorkshire | Azincourt | France |
| Middlesbrough | Middlesbrough | Dunkerque | France |
| Middlesbrough | Middlesbrough | Masvingo | Zimbabwe |
| Middlesbrough | Middlesbrough | Middlesboro | USA |
| Middlesbrough | Middlesbrough | Oberhausen/Rheinl. | Germany |
| Midhurst | West Sussex | Baiersbronn | Germany |
| Midhurst | West Sussex | Nogent-Le-Rotrou | France |
| Midlothian | Midlothian | Heinsberg Lk. | Germany |
| Midlothian | Midlothian | Komarom Estergom County | Hungary |
| Mildenhall | Suffolk | Luc-Sur-Mer | France |
| Milford Haven | Pembrokeshire | Romilly-Sur-Seine | France |
| Milford Haven | Pembrokeshire | Uman | Ukraine |
| Millbrook | Cornwall | Plouider | France |
| Milverton | Somerset | Longny-Au-Perche | France |
| Minehead | Somerset | St-Berthevin | France |
| Minety | Wiltshire | Chambon-Sur-Voueize | France |
| Modbury | Devon | Le Faou | France |
| Monifieth | Dundee | Soyaux | France |
| Monklands | North Lanarkshire | Airdrie | Canada |
| Monklands | North Lanarkshire | Campi Bisenzio | Italy |
| Monklands | North Lanarkshire | Gatchina | Russia |
| Monklands | North Lanarkshire | St-Denis | France |
| Monmouth | Monmouthshire | Carbonne | France |
| Monmouth | Monmouthshire | Waldbronn | Germany |
| Monmouthshire | Monmouthshire | Aube | France |
| Monmouthshire | Monmouthshire | Guangxi Zhauang | China |
| Monmouthshire | Monmouthshire | Karlsruhe Lk | Germany |
| Montrose | Angus | Luzarches | France |
| Morchard Bishop | Devon | St-Gatien-Des-Bois | France |
| Moretonhampstead | Devon | Betton | France |
| Mossley | Greater Manchester | Hem | France |
| Motherwell | North Lanarkshire | Schweinfurt | Germany |
| Moyle | Co Antrim | Balnasloe | Ireland |
| Moyle | Co Antrim | Pourrieres | France |
| Much Wenlock | Shopshire | Cysoing | France |
| Mumbles | Swansea | Kinsale | Republic of Ireland |
| Musselburgh | East Lothian | Champigny-Sur-Marne | France |
| Musselburgh | East Lothian | Rosignano Marittimo | Italy |
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