- Mainwaring River (see Winnipeg Lake)
- Makkovik
- Mamattawa (see Cappoonicagomie)
- Manchester House
- Manitoba Lake
- Manitou
- Mansel Island
- Manuan (Manowan)
- Marlboro House
- Martin Fall
- Massett
- Matachewan
- Matawagamingue
- Mattagami (see Matawagamingue and Michipicoten)
- Mattawa
- Mattice
- McDame Creek
- Fort McKay
- Fort McKenzie
- McLeod Lake
- Fort McLoughlin
- Fort McMurray
- Merry's House
- Mesackamy Lake
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- Mesaugamee Lake
- Metabetchuoan (Lac Saint-Jean)
- Point Meuron (see Fort William (Lake Superior))
- Micabanish (see Missinaibi River)
- Michikamau House
- Michipicoten
- Migiskan
- Miminiska Lake
- Minaki
- Mingan
- Mingan Fur Farm
- Missanabie
- Missinaibi
- Mississagi
- Mistassini
- Mittimatalik (see Pond Inlet)
- Montizambert
- Montreal
- Montreal Lake
- Moose Factory
- Moose Lake
- Moosonee
- Morden
- Muskwaro
- Mutton Bay
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