M
- M'Chigeeng
- Mabee's Corners
- Macdiarmid
- MacDonald Bay
- MacDonald Grove
- MacDuff
- Macey Bay
- MacGillivrays Bridge
- Mackenzie
- MacKenzie Point
- Mackey
- Mackey Siding
- Macksville
- MacLarens Landing
- MacTier
- Macton
- Macville
- Madawaska
- Madigans
- Madoc
- Madsen
- Magnetawan
- Maguire
- Maidstone
- Maitland, Huron County
- Maitland, United Counties of Leeds and Grenville
- Malahide
- Malakoff
- Malcolm
- Mallorytown
- Malone
- Malton
- Manbert
- Manchester
- Manhard
- Manilla
- Manions Corners
- Manitou Dock
- Manitouwadge
- Manitowaning
- Mannheim
- Manotick
- Mansewood
- Mansfield, Dufferin County
- Manvers Township
- Maple
- Maple Beach
- Maple Grove
- Maple Hill, Bruce County
- Maple Hill, Frontenac County
- Maple Hill, York Regional Municipality
- Maple Island
- Maple Lane
- Maple Leaf
- Mapleton
- Maple Valley, Clearview
- Maple Valley, Severn
- Maplewood
- Marathon
- Marble Bluff
- Marden
- Marlbank
- Mariposa
- Mariposa Beach
- Markdale
- Markham
- Markstay
- Marmion
- Marmora and Lake
- Marmora
- Marmora Station
- Marsh Hill
- Marsville
- Marten River
- Martins
- Martins Corner
- Martintown
- Marionville
- Maryhill
- Marysville, Frontenac County, Ontario; Marysville, Hastings County, Ontario
- Massanoga
- Massey
- Massie
- Matachewan
- Mathers Corners
- Mattagami First Nation
- Mattawa
- Mattawan
- Mattice
- Maxville
- Maxwell, Grey County
- Maxwell, Hastings County
- Maxwells
- Mayfield West
- Mayhew
- Mayhews Landing
- Maynard
- Maynooth
- Maynooth Station
- McAlpine Corners
- McCann's Shore
- McCarleys Corners
- McConkey
- McCormick
- McCrackens Landing
- McCrae
- McCreary's Shore
- McCrimmon
- McCulloughs Landing
- McDougall
- McGarry
- McGarry Flats
- McGinnis Creek
- McGrath
- McGregor
- McGuires Settlement
- McIntosh, Bruce County
- McIntosh, Kenora District
- McIntyre, Grey County
- McIntyre, Lennox and Addington County
- McIvor
- McKellar
- McKerrow
- McKillop
- McLean
- McLeansville
- McMillans Corners
- McNaughton Shore
- McRoberts Corner
- Meaford
- Meadowvale
- Medina
- Melancthon
- Melbourne
- Meldrum Bay
- Melissa
- Menie
- Merlin
- Merrickville
- Metcalfe
- Meyersburg
- Michipicoten
- Micksburg
- Middleport
- Middleville
- Midhurst
- Midland
- Mildmay
- Milford
- Milford Bay
- Millbank
- Miller Lake
- Millhaven
- Milliken
- Milnet
- Milton
- Milverton
- Mimico
- Minaki
- Mindemoya
- Minden
- Mine Centre
- Minesing
- Minett
- Minto
- Mishkeegogamang First Nation
- Missanabie
- Mississauga
- Mississippi Station
- Mitchell
- Mitchell's Bay
- Mitchell's Corners
- Mitchellville
- Moffat
- Moira
- Monck
- Monetville
- Monkland
- Monkton
- Mono
- Mono Mills
- Monteagle
- Monteith
- Monticello
- Monument Corner
- Moonbeam
- Moonstone
- Moorefield
- Mooresburg
- Moores Lake
- Mooretown
- Moose Creek
- Moose Factory
- Moosonee
- Moray
- Morganston
- Morrisburg
- Morson
- Morrison Landing
- Mortimer's Point
- Morven
- Mosborough
- Moscow
- Mossley
- Mountain
- Mountain Grove
- Mountain View Beach
- Mount Albert
- Mount Brydges
- Mount Carmel, Prince Edward County, Ontario; Mount Carmel, Essex County, Ontario; Mount Carmel, Haldimand County, Ontario; Mount Carmel, Middlesex County, Ontario
- Mount Elgin
- Mount Forest
- Mount Hope, Bruce County
- Mount Hope, Hamilton
- Mount Joy
- Mount Julian
- Mount Pleasant, Brampton
- Mount Pleasant, Brant County
- Mount Pleasant, Grey County
- Mount Pleasant, Hastings County
- Mount Pleasant, Lennox and Addington County
- Mount Pleasant, Perth County
- Mount Pleasant, Peterborough County
- Mount Pleasant, York Regional Municipality
- Mount Salem
- Mount St. Patrick
- Muncey
- Mullifarry
- Mulmur
- Mulock
- Muncey
- Munster
- Murchison
- Murillo
- Musclow
- Muskoka
- Muskoka Lodge
- Musselman Lake
- Myers Cave
- Myrtle
- Myrtle Station
Read more about this topic: List Of Communities In Ontario