The New Democratic Party of Ontario (NDP) fielded a full slate of candidates in the 1990 provincial election , and won a majority government with 74 out of 130 seats. Many candidates have their own biography pages; information about others may be found here.
| Riding | Candidate's Name | Notes | Residence | Occupation | Votes | % | Rank |
|---|---|---|---|---|---|---|---|
| Dufferin—Caledon | Sandra Crane | 8,627 | 27.4 | 3rd | |||
| Hastings—Peterborough | Elmer Buchanan | 11,283 | 39.9 | 1st | |||
| Muskoka–Georgian Bay | Dan Waters | ONDP candidate for Muskoka–Georgian Bay in the 1987 provincial election | 13,422 | 40.63 | 1st | ||
| Northumberland | Judi Armstrong | 9,581 | 26.8 | 3rd | |||
| Peterborough | Jenny Carter | Peterborough | Teacher [1] | 13,813 | 33.0 | 1st | |
| Simcoe Centre | Paul Wessenger | Member of Barrie City Council (1973–1976) | Lawyer | 15,711 | 37.8 | 1st | |
| Simcoe East | Dennis Bailey | 14,088 | 37.7 | 2nd | |||
| Simcoe West | Leo Loserit | 9,870 | 30.8 | 2nd | |||
| Victoria—Haliburton | Dennis Drainville | Anglican priest | 15,467 | 44.3 | 1st |
| Riding | Candidate's Name | Notes | Residence | Occupation | Votes | % | Rank |
|---|---|---|---|---|---|---|---|
| Carleton | Alex Munter | Kanata | Newspaper editor/Journalist | 10,071 | 26.5 | 3rd | |
| Carleton East | Joan Gullen | 9,976 | 28.2 | 2nd | |||
| Cornwall | Leo Courville | 7,044 | 26.5 | 2nd | |||
| Frontenac—Addington | Fred Wilson | Kingston | Workers' compensation professional | 9,696 | 33.2 | 1st | |
| Kingston and the Islands | Gary Wilson | Kingston | Union leader (CUPE)/Librarian | 10,184 | 38.0 | 1st | |
| Lanark—Renfrew | Harry Martin | 8,541 | 25.1 | 3rd | |||
| Leeds—Grenville | Art Lane | 8,312 | 24.2 | 3rd | |||
| Nepean | John Raudoy | 7,453 | 23.1 | 3rd | |||
| Ottawa Centre | Evelyn Gigantes | Member of Provincial Parliament for Ottawa Centre (1985–1987) Member of Provincial Parliament for Carleton East (1975–1981) | Radio/television broadcaster | 14,522 | 47.7 | 1st | |
| Ottawa East | Lori Lucier | 6,103 | 23.3 | 3rd | |||
| Ottawa–Rideau | Larry Jones | 8,845 | 29.8 | 2nd | |||
| Ottawa South | Margaret Armstrong | 7,826 | 25.9 | 2nd | |||
| Ottawa West | Allan Edwards | 8,391 | 25.1 | 3rd | |||
| Prince Edward—Lennox | Paul Johnson | Member of Athol Township Council (1988–1990) | Prince Edward | Lawyer | 9,204 | 33.2 | 1st |
| Quinte | Greg Meehan | 7,010 | 23.6 | 2nd | |||
| Renfrew North | Ish Theilheimer | Magazine publisher | 5,916 | 19.6 | 3rd | ||
| Stormont—Dundas—Glengarry and East Grenville | Helena McCuaig | 5,357 | 18.4 | 3rd |
| Riding | Candidate's Name | Notes | Residence | Occupation | Votes | % | Rank |
|---|---|---|---|---|---|---|---|
| Beaches—Woodbine | Frances Lankin | 14,381 | 58.4 | 1st | |||
| Brampton North | John Devries | 11,588 | 34.6 | 2nd | |||
| Brampton South | John Scheer | 12,494 | 31.2 | 2nd | |||
| Burlington South | Bob Wood | 8,185 | 25.2 | 2nd | |||
| Don Mills | Margery Ward | 9,740 | 34.2 | 1st | |||
| Dovercourt | Tony Silipo | Toronto Board of Education Trustee (1978–1990) | Lawyer | 10,604 | 54.2 | 1st | |
| Downsview | Anthony Perruzza | Member of North York City Councill for Ward 5 (1988–1990) Metropolitan Separate School Board Trustee for Ward 15 (1985–1988) | 13,440 | 56.6 | 1st | ||
| Durham Centre | Drummond White | Social worker | 12,594 | 35.9 | 1st | ||
| Durham East | Gord Mills | Member of Barrie City Council (1976–1982) | Tax auditor | 10,960 | 32.7 | 1st | |
| Durham West | Jim Wiseman | ONDP candidate for Durham West in the 1987 provincial election | Ajax | Teacher | 16,366 | 37.5 | 1st |
| Durham—York | Larry O'Connor | Auto Worker | 12,297 | 33.9 | 1st | ||
| Eglinton | Jay Waterman | 7,772 | 23.2 | 3rd | |||
| Etobicoke–Humber | Russ Springate | 10,049 | 28.6 | 2nd | |||
| Etobicoke—Lakeshore | Ruth Grier | Member of Etobicoke City Council for Mimico (1969–1985) | 18,118 | 57.2 | 1st | ||
| Etobicoke—Rexdale | Ed Philip | 17,620 | 67.0 | 1st | |||
| Etobicoke West | Judy Jones | 7,992 | 23.6 | 3rd | |||
| Fort York | Rosario Marchese | 11,023 | 46.3 | 1st | |||
| Halton Centre | Richard Banigan | 10,163 | 26.4 | 3rd | |||
| Halton North | Noel Duignan | Georgetown | Executive assistant | 8,510 | 30.9 | 1st | |
| High Park—Swansea | Elaine Ziemba | 11,432 | 45.1 | 1st | |||
| Lawrence | Shalom Schachter | 10,179 | 38.6 | 2nd | |||
| Markham | Rob Saunders | 8,459 | 16.5 | 3rd | |||
| Mississauga East | Mike Crone | 9,177 | 29.0 | 2nd | |||
| Mississauga North | John Foster | 11,216 | 33.5 | 2nd | |||
| Mississauga South | Sue Craig | 7,579 | 23.2 | 2nd | |||
| Mississauga West | Tom Malone | 13,938 | 29.3 | 2nd | |||
| Oakville South | Danny Dunleavy | 6,423 | 20.5 | 3rd | |||
| Oakwood | Tony Rizzo | 10,423 | 48.7 | 1st | |||
| Oriole | Lennox Farrell | 8,441 | 33.2 | 2nd | |||
| Oshawa | Allan Pilkey | 16,601 | 61.1 | 1st | |||
| Parkdale | Sheena Weir | 7,557 | 43.4 | 2nd | |||
| Riverdale | Marilyn Churley | 14,086 | 62.0 | 1st | |||
| Scarborough—Agincourt | Ayoub Ali | 6,763 | 22.5 | 3rd | |||
| Scarborough Centre | Steve Owens | 12,324 | 45.2 | 1st | |||
| Scarborough East | Bob Frankford | 11,700 | 35.5 | 1st | |||
| Scarborough—Ellesmere | David Warner | Teacher | 14,036 | 48.2 | 1st | ||
| Scarborough North | Victor Deane | 9,477 | 31.5 | 2nd | |||
| Scarborough West | Anne Swarbrick | 14,340 | 51.2 | 1st | |||
| St. Andrew—St. Patrick | Zanana Akande | 10,321 | 34.5 | 1st | |||
| St. George—St. David | Carolann Wright | 10,646 | 35.8 | 2nd | |||
| Willowdale | Batya Hebdon | 9,125 | 26.9 | 3rd | |||
| Wilson Heights | John Fagan | 9,618 | 34.7 | 2nd | |||
| York Centre | Laurie Orrett | 18,850 | 30.6 | 2nd | |||
| York East | Gary Malkowski | 10,689 | 35.8 | 1st | |||
| York—Mackenzie | Keith Munro | 10,681 | 31.9 | 3rd | |||
| York Mills | Marcia McVea | 4,830 | 16.5 | 3rd | |||
| York South | Bob Rae | 16,642 | 66.7 | 1st | |||
| Yorkview | Giorgio Mammoliti | 9,945 | 49.6 | 1st |
| Riding | Candidate's Name | Notes | Residence | Occupation | Votes | % | Rank |
|---|---|---|---|---|---|---|---|
| Brantford | Brad Ward | Member of Brantford City Council (1985–1990) | 17,736 | 48.6 | 1st | ||
| Brantford—Brant | Chris Stanek | 9,282 | 32.2 | 2nd | |||
| Bruce | Len Hope | 7,954 | 26.2 | 2nd | |||
| Bruce—Grey—Owen Sound | Peggy Hutchinson | 11,280 | 29.6 | 2nd | |||
| Cambridge | Mike Farnan | Member of Provincial Parliament for Cambridge (1987–1995) | Teacher | 21,806 | 60.3 | 1st | |
| Chatham—Kent | Randy Hope | President of the Canadian Auto Workers Local 1941 (1985–1990) | Chatham-Kent | Auto worker | 13,930 | 44.7 | 1st |
| Elgin | Peter North | Southwold | Construction contractor | 14,189 | 41.7 | 1st | |
| Essex–Kent | Pat Hayes | Member of Provincial Parliament for Essex North (1985–1987) | Work safety professional/Union official (CAW) | 15,858 | 52.7 | 1st | |
| Essex South | Donna Tremblay | 10,363 | 35.3 | 2nd | |||
| Guelph | Derek Fletcher | Wellington County Public School Board Trustee (1985–1990) | Guelph | Press operator | 15,051 | 37.9 | 1st |
| Huron | Paul Klopp | ONDP candidate for Huron in the 1987 provincial election ONDP candidate for Huron–Middlesex in the 1985 provincial election | Bluewater | Farmer | 10,020 | 34.5 | 1st |
| Kitchener | Will Ferguson | Member of Kitchener City Council (1979–1990) | Kitchener | 15,750 | 46.8 | 1st | |
| Kitchener—Wilmot | Mike Cooper | ONDP candidate for Kitchener—Wilmot in the 1987 and 1985 provincial elections | Rubber worker | 16,056 | 43.9 | 1st | |
| Lambton | Ellen MacKinnon | Lambton County Public School Board Trustee (1988–1990) Member of Plympton Town Council (1977–1979) | Lambton County | Farmer | 8,691 | 31.4 | 1st |
| London Centre | Marion Boyd | ONDP candidate for London Centre in the 1987 provincial election ONDP candidate for London North in the 1985 provincial election | London | 17,837 | 51.3 | 1st | |
| London North | Carolyn Davies | 14,005 | 32.0 | 2nd | |||
| London South | David Winninger | ONDP candidate for London South in the 1987 and 1985 provincial elections | Lawyer | 17,438 | 42.4 | 1st | |
| Middlesex | Irene Mathyssen | Ilderton | Teacher | 12,522 | 32.6 | 1st | |
| Norfolk | Norm Jamison | ONDP candidate for Norfolk in the 1987 provincial election | Metalworker | 14,850 | 41.0 | 1st | |
| Oxford | Kimble Sutherland | Ingersoll | University student | 12,684 | 34.7 | 1st | |
| Perth | Karen Haslam | Teacher | 11,712 | 36.8 | 1st | ||
| Sarnia | Bob Huget | President of Energy and Chemical Workers Union Local 800 | 10,860 | 36.7 | 1st | ||
| Waterloo North | Hugh Miller | 11,298 | 29.1 | 3rd | |||
| Wellington | Dale Hamilton | 10,837 | 35.4 | 2nd | |||
| Windsor—Riverside | Dave Cooke | Member of Provincial Parliament for Windsor—Riverside (1977–1997) | Windsor | Social worker | 21,144 | 71.0 | 1st |
| Windsor—Sandwich | George Dadamo | ONDP candidate for Windsor—Sandwich in the 1987 provincial election | Windsor | Radio broadcaster | 15,952 | 54.4 | 1st |
| Windsor—Walkerville | Wayne Lessard | Windsor | Lawyer | 15,899 | 55.2 | 1st |