M
- Madingley Hall: TL395605
- Madingley Wood: TL402597
- Magog Down: TL493528
- Malton: TL372483
- Manea (Carrolls ground): TL491890
- Manea Fifties: TL512918
- Manea Pit: TL482892
- Manea (Willow Farm): TL490900
- Manor Farm (Fowlmere) - See Fowlmere (Manor Farm)
- March Farmers - See Nene Washes (March Farmers)
- March Tip: TL408987
- March (Whitemoor Tip) - See March Tip
- Mare Fen: TL366697
- Mare Way (Eversden): TL352524
- Marholm: TF148022
- Marsh Lane GP: TL298698
- Maxey: TF128081
- Maxey GP: TF130075
- McCains BP: TL237970
- Melbourn: TL385445
- Melbourn Bury: TL374443
- Meldreth: TL375460
- Meldreth Pits: TL385465
- Mepal: TL440810
- Mepal Airfield: TL440795
- Mepal GP: TL425830
- Mere Farm (Ramsey) - See Ramsey (Mere Farm)
- Mere Way Impington: TL460628
- Merryshaws Spinney: TF091029
- Middle Fen: TL355696
- Midloe Grange Farm: TL164646
- Milking Nook: TF184058
- Mill Pond, Cambridge: TL446578
- Milton CP: TL480625
- Milton Park: TL145995
- Milton Tip: TL467625
- Molesworth Airfield: TL080775
- Monks Hardwick: TL214615
- Monks Wood: TL200800
- Moonshine Gap: TL128857
- Morborne: TL139914
- Morborne Hill: TL125914
- Morton's Leam: TL280988
- Mucklands Wood: TF156016
- Murrow: TF379056
- Must Farm Pit - See McCain BP
- Mutlow Hill: TL5454