# Liste des circonscriptions électorales provinciales de l'Ontario

Cette liste des circonscriptions électorales provinciales de l’Ontario recense les 107 circonscriptions électorales provinciales de l’Ontario.
| Circonscription électorale | Créée | Disputée pour la 1re fois | Population | Député |
| Ajax | 2015 | 2018 | 119 680 | Patrice Barnes |
| Algoma—Manitoulin | 1934 | 1934 | 68 480 | Michael Mantha |
| Aurora—Oak Ridges—Richmond Hill | 2015 | 2018 | 115 225 | Michael Parsa |
| Baie de Quinte | 2015 | 2018 | 109 735 | Todd Smith |
| Barrie—Innisfil | 2015 | 2018 | 109 285 | Andrea Khanjin |
| Barrie—Springwater—Oro-Medonte | 2015 | 2018 | 100 785 | Doug Downey |
| Beaches—East York | 1996 | 1999 | 109 465 | Mary-Margaret McMahon |
| Brampton-Centre | 2015 | 2018 | 102 275 | Charmaine Williams |
| Brampton-Est | 2015 | 2018 | 12 200 | Hardeep Grewal |
| Brampton-Nord | 2015 | 2018 | 121 185 | Graham McGregor |
| Brampton-Ouest | 2004 | 2007 | 130 005 | Amarjot Sandhu |
| Brampton-Sud | 2015 | 2018 | 118 185 | Prabmeet Sarkaria |
| Brantford—Brant | 2015 | 2018 | 130 300 | Will Bouma |
| Bruce—Grey—Owen Sound | 1999 | 1999 | 107 675 | Rick Byers |
| Burlington | 1999 | 1999 | 123 185 | Natalie Pierre |
| Cambridge | 1975 | 1979 | 115 460 | Brian Riddell |
| Carleton | 2015 | 2018 | 102 915 | Goldie Ghamari |
| Chatham-Kent—Leamington | 2015 | 2018 | 109 620 | Trevor Jones |
| Davenport | 1996 | 1999 | 108 475 | Marit Stiles |
| Don Valley-Est | 1999 | 1999 | 94 575 | Adil Shamji |
| Don Valley-Nord | 1999 | 1999 | 110 080 | Vincent Ke |
| Don Valley-Ouest | 1999 | 2022 | 102 510 | Stephanie Bowman |
| Dufferin—Caledon | 1987 | 1988 | 128 240 | Sylvia Jones |
| Durham | 1999 | 1999 | 130 870 | Todd McCarthy |
| Eglinton—Lawrence | 1999 | 1999 | 114 400 | Robin Martin |
| Elgin—Middlesex—London | 1999 | 1999 | 115 055 | Rob Flack |
| Essex | 1999 | 1999 | 125 440 | Anthony Leardi |
| Etobicoke-Centre | 1999 | 1999 | 118 020 | Kinga Surma |
| Etobicoke-Nord | 1999 | 1999 | 118 045 | Doug Ford |
| Etobicoke—Lakeshore | 1987 | 1988 | 129 080 | Christine Hogarth |
| Flamborough—Glanbrook | 2015 | 2018 | 111 070 | Donna Skelly |
| Glengarry—Prescott—Russell | 1999 | 1999 | 109 980 | Stéphane Sarrazin |
| Guelph | 2004 | 2007 | 131 790 | Mike Schreiner |
| Haldimand—Norfolk | 1999 | 1999 | 109 655 | Bobbi Ann Brady |
| Haliburton—Kawartha Lakes— Brock | 1999 | 1999 | 113 960 | Laurie Scott |
| Hamilton Mountain | 1976 | 1977 | 104 875 | Monique Taylor |
| Hamilton-Centre | 1926 | 1926 | 100 100 | Sarah Jama (en) |
| Hamilton-Est—Stoney Creek | 2006 | 2007 | 107 845 | Neil Lumsden |
| Hamilton-Ouest—Ancaster—Dundas | 2015 | 2018 | 113 025 | Sandy Shaw |
| Hastings—Lennox and Addington | 2015 | 2018 | 94 330 | Ric Bresee |
| Humber River—Black Creek | 2015 | 2018 | 108 035 | Tom Rakocevic |
| Huron—Bruce | 1952 | 1953 | 106 570 | Lisa Thompson |
| Kanata—Carleton | 2015 | 2018 | 110 965 | Merrilee Fullerton |
| Kenora—Rainy River | 1999 | 1999 | 53 027 | Greg Rickfort |
| Kiiwetinoong | 2015 | 2018 | 32 987 | Sol Mamakwa |
| King—Vaughan | 2015 | 2018 | 131 995 | Stephen Lecce |
| Kingston et les Îles | 1966 | 1967 | 117 545 | Ted Hsu |
| Kitchener-Centre | 1999 | 1999 | 105 260 | Laura Mae Lindo |
| Kitchener—Conestoga | 2006 | 2007 | 100 705 | Michael Harris |
| Kitchener-Sud—Hespeler | 2015 | 2018 | 105 305 | Jess Dixon |
| Lambton—Kent—Middlesex | 1999 | 1999 | 105 335 | Monte McNaughton |
| Lanark—Frontenac—Kingston | 2015 | 2018 | 101 635 | John Jordan |
| Leeds—Grenville—Thousand Islands et Rideau Lakes | 2015 | 2018 | 100 545 | Steve Clark |
| London-Centre-Nord | 1999 | 1999 | 125 360 | Terence Kernaghan |
| London—Fanshawe | 1999 | 1999 | 119 470 | Teresa Armstrong |
| London-Ouest | 1999 | 1999 | 126 110 | Peggy Sattler |
| Markham—Stouffville | 2015 | 2018 | 126 060 | Paul Calandra |
| Markham—Thornhill | 2015 | 2018 | 99 075 | Logan Kanapathi |
| Markham—Unionville | 2003 | 2007 | 123 320 | Billy Pang |
| Milton | 2015 | 2018 | 114 090 | Parm Gill |
| Mississauga-Centre | 2015 | 2018 | 124 845 | Natalia Kusendova |
| Mississauga—Erin Mills | 2015 | 2018 | 122 656 | Sheref Sabawy |
| Mississauga-Est—Cooksville | 2003 | 2007 | 120 205 | Kaleed Rasheed |
| Mississauga—Lakeshore | 2015 | 2018 | 117 440 | Rudy Cuzzetto |
| Mississauga—Malton | 2015 | 2018 | 118 240 | Deepak Anand |
| Mississauga—Streetsville | 2003 | 2007 | 118 305 | Nina Tangri |
| Mushkegowuk—Baie James | 2015 | 2018 | 30 037 | Guy Bourgouin |
| Nepean | 2015 | 2018 | 119 115 | Lisa MacLeod |
| Newmarket—Aurora | 2006 | 2007 | 117 415 | Dawn Gallagher Murphy |
| Niagara Falls | 1914 | 1914 | 136 290 | Wayne Gates |
| Niagara-Centre | 2015 | 2018 | 109 070 | Jeff Burch |
| Niagara-Ouest | 2015 | 2018 | 90 840 | Sam Oosterhoff |
| Nickel Belt | 1952 | 1955 | 84 520 | France Gélinas |
| Nipissing | 1890 | 1890 | 75 060 | Vic Fedeli |
| Northumberland—Peterborough-Sud | 2015 | 2018 | 112 415 | David Piccini |
| Oakville | 1999 | 1999 | 120 920 | Stephen Crawford |
| Oakville-Nord—Burlington | 2015 | 2018 | 129 080 | Effie Triantafilopoulos |
| Orléans | 2015 | 2018 | 128 280 | Stephen Blais |
| Oshawa | 1952 | 1955 | 126 765 | Jennifer French |
| Ottawa-Centre | 1966 | 1968 | 118 040 | Joel Harden |
| Ottawa Ouest—Nepean | 1999 | 1999 | 111 835 | Chandra Pasma |
| Ottawa-Sud | 1925 | 1926 | 121 055 | John Fraser |
| Ottawa—Vanier | 1908 | 1908 | 111 510 | Lucille Collard |
| Oxford | 1999 | 1999 | 113 790 | Ernie Hardeman |
| Parkdale—High Park | 1996 | 1999 | 108 805 | Bhutila Karpoche |
| Parry Sound—Muskoka | 1999 | 1999 | 94 400 | Graydon Smith |
| Perth—Wellington | 2006 | 2007 | 107 905 | Matthew Rae |
| Peterborough—Kawartha | 2015 | 2018 | 118 175 | Dave Smith |
| Pickering—Uxbridge | 2015 | 2018 | 112 945 | Peter Bethlenfalvy |
| Renfrew—Nipissing—Pembroke | 1999 | 1999 | 103 495 | John Yakabuski |
| Richmond Hill | 2003 | 2007 | 110 180 | Daisy Wai |
| Sarnia—Lambton | 1999 | 1999 | 105 335 | Bob Bailey |
| Sault Ste. Marie | 1890 | 1890 | 73 370 | Ross Romano |
| Scarborough—Agincourt | 1987 | 1987 | 105 540 | Aris Babikian |
| Scarborough-Centre | 1963 | 1963 | 112 600 | David Smith |
| Scarborough—Guildwood | 2006 | 2007 | 102 390 | Mitzie Hunter |
| Scarborough-Nord | 2015 | 2018 | 98 805 | Raymond Cho |
| Scarborough—Rouge Park | 2015 | 2018 | 102 275 | Vijay Thanigasalam |
| Scarborough-Sud-Ouest | 1999 | 1999 | 110 280 | Doly Begum |
| Simcoe—Grey | 1999 | 1999 | 129 940 | Brian Saunderson |
| Simcoe-Nord | 1999 | 1999 | 111 335 | Jill Dunlop |
| Spadina—Fort York | 2015 | 2018 | 115 510 | Chris Glover |
| St. Catharines | 1966 | 1967 | 111 690 | Jennie Stevens |
| Stormont—Dundas—South Glengarry | 2004 | 2007 | 103 320 | Nolan Quinn |
| Sudbury | 1905 | 1908 | 80 840 | Jamie West |
| Thornhill | 1999 | 1999 | 112 720 | Laura Smith |
| Thunder Bay—Atikokan | 1999 | 1999 | 75 920 | Kevin Holland |
| Thunder Bay—Supérieur-Nord | 1999 | 1999 | 70 475 | Lise Vaugeois |
| Timiskaming—Cochrane | 1999 | 1999 | 67 290 | John Vanthof |
| Timmins | 2015 | 2018 | 41 785 | George Pirie |
| Toronto-Centre | 1999 | 1999 | 103 805 | Kristyn Wong-Tam |
| Toronto—Danforth | 1999 | 1999 | 106 880 | Peter Tabuns |
| Toronto—St. Paul's | 2015 | 2018 | 107 900 | Jill Andrew |
| University—Rosedale | 2015 | 2018 | 104 315 | Jessica Bell |
| Vaughan—Woodbridge | 2015 | 2018 | 105 225 | Michael Tibollo |
| Waterloo | 2015 | 2018 | 110 135 | Catherine Fife |
| Wellington—Halton Hills | 2004 | 2007 | 120 985 | Ted Arnott |
| Whitby | 2015 | 2018 | 128 380 | Lorne Coe |
| Willowdale | 1987 | 1987 | 118 805 | Stan Cho |
| Windsor-Ouest | 1996 | 1999 | 122 990 | Lisa Gretzky |
| Windsor—Tecumseh | 1996 | 1999 | 117 430 | Andrew Dowie |
| York-Centre | 1999 | 1999 | 104 320 | Michael Kerzner |
| York—Simcoe | 2006 | 2007 | 104 015 | Caroline Mulroney |
| York-Sud—Weston | 1999 | 1999 | 116 690 | Michael Ford |