right|thumb|275px|Ontarion kunnat merkittynä punaisella Luettelo Ontarion kunnista kattaa Kanadan provinssin Ontarion kunnat. Ontariossa on kaksinkertainen kuntajärjestelmä. Ylemmällä tasolla ovat aluekunnat, jotka jakautuvat kuntiin. Lisäksi on olemassa yhden tason kuntia jotka toimittavat sekä kuntien että aluekuntien tehtävät. Ontariossa on siis kolme kuntatyyppiä. Kuntia on Ontariossa yhteensä 444.
Kunnallishallinto kattaa ainoastaan 17 % provinssin pinta-alasta. Samalla kuitenkin 99 % provinssin väestöstä asuu jossakin kunnassa. Paikallishallinto kuntien ulkopuolella on järjestetty piireittäin. Ontarion kymmenen piiriä tarjoaa välttämättömimmät aluekuntien ja kuntien palvelut pohjoisen harvaanasutuilla alueilla.
Ontariossa on aluekuntia 30, yhden tason kuntia 173 ja kuntia 241. Ontarion kuntalain mukaan aluekunnat voivat käyttää nimitystä county, regional municipality tai district municipality. Kunnat voivat käyttää nimitystä city, town, township ja village.
Aluekunnat Nimi Tyyppi Asukasluku(2011) Asukasluku(2006) Muutos(%) Pinta-ala(km²) As./km² Bruce County Dufferin County Durham Regional municipality Elgin County Essex County Frontenac County Grey County Haliburton County Halton Regional municipality Hastings County Huron County Lambton County Lanark County Leeds and Grenville United counties Lennox and Addington County Middlesex County Muskoka Regional municipality Niagara Regional municipality Northumberland County Oxford Regional municipality Peel Regional municipality Perth County Peterborough County Prescott and Russell United counties Renfrew County Simcoe County Stormont, Dundas and Glengarry United counties Waterloo Regional municipality Wellington County York Regional municipality
Yhden tason kunnat Nimi Tyyppi Asukasluku(2011) Asukasluku(2006) Muutos(%) Pinta-ala(km²) As./km² Alberton Township ArchipelagoThe Archipelago Township Armour Township Armstrong Township Assiginack Township Atikokan Town Baldwin Township Barrie City Belleville City Billings Township Black River-Matheson Township Blind River Town Bonfield Township Brant City Brantford City Brethour Township Brockville City 0 Bruce Mines Town Burk's Falls Village Burpee and Mills Township Callander Municipality Calvin Municipality Carling Township Casey Township Central Manitoulin Municipality Chamberlain Township Chapleau Township Chapple Township Charlton and Dack Municipality Chatham-Kent Municipality Chisholm Township Cobalt Town Cochrane Town Cockburn Island Township Coleman Township Conmee Township Cornwall City Dawson Township Dorion Township Dryden City Dubreuilville Township Ear Falls Township East Ferris Township Elliot Lake City Emo Township Englehart Town Espanola Town Evanturel Township Fauquier-Strickland Township Fort Frances Town French River Municipality Gananoque Town Gauthier Township Gillies Township Gordon/Barrie Island Municipality Gore Bay Town Greater Sudbury City Greenstone Municipality Guelph City Haldimand City Hamilton City Harley Township Harris Township Hearst Town Hilliard Township Hilton Beach Village Hilton Township Hornepayne Township Hudson Township Huron Shores Municipality Ignace Township Iroquois Falls Town James Township Jocelyn Township Johnson Township Joly Township Kapuskasing Town Kawartha Lakes City Kearney Town Kenora City Kerns Township Killarney Municipality Kingston City Kirkland Lake Town La Vallee Township 0 Laird Township Lake of the Woods Township Larder Lake Township Latchford Town London City Macdonald, Meredith and Aberdeen Additional Township Machar Township Machin Township Magnetawan Municipality Manitouwadge Township Marathon Town Markstay-Warren Municipality 0 Matachewan Township Mattawa Town Mattawan Township Mattice-Val Côté Township McDougall Township McGarry Township McKellar Township McMurrich/Monteith Township Moonbeam Township Moosonee Town Morley Township Nairn and Hyman Township Neebing Municipality 0 Nipigon Township Nipissing Township Norfolk City . North Bay City North ShoreThe North Shore Township Northeastern Manitoulin and the Islands Town O'Connor Township Oliver Paipoonge Municipality Opasatika Township Orillia City Ottawa City Papineau-Cameron Township Parry Sound Town Pelee Township Pembroke City Perry Township Peterborough City Pickle Lake Township Plummer Additional Township Powassan Municipality Prescott Town Prince Edward City Prince Township Quinte West City Rainy River Town Red Lake Municipality Red Rock Township Ryerson Township Sables-Spanish Rivers Township Sault Ste. Marie City Schreiber Township Seguin Township Shuniah Municipality Sioux Lookout Municipality Sioux Narrows-Nestor Falls Township Smiths Falls Town Smooth Rock Falls Town South Algonquin Township South River Village Spanish Town St. Joseph Township St. Marys Town St. Thomas City St. Charles Municipality Stratford City Strong Township Sundridge Village Tarbutt and Tarbutt Additional Township Tehkummah Township Temagami Municipality Temiskaming Shores City Terrace Bay Township Thessalon Town Thornloe Village Thunder Bay City Timmins City Toronto City Val Rita-Harty Township Wawa Municipality West Nipissing Municipality White River Township Whitestone Municipality Windsor City
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