The following are the results by riding (electoral district) of the 1990 Ontario general election, that was held on September 6, 1990.

Constituency results

Ottawa-Carleton

| style="background:whitesmoke;"|Carleton Total votes: 38,074 | |Sue LeBrun 10,143 (26.6%) || |Norm Sterling 17,860 (46.9%) | |Alex Munter 10,071 (26.5%)

|Norm Sterling |- | style="background:whitesmoke;"|Carleton East Total votes: 35,376 || |Gilles Morin 19,059 (53.9%) | |Judy Corbishley 5,117 (14.5%) | |Joan Gullen 9,976 (28.2%) | |W. André Lafrance (FCP) 1,224 (3.5%) || |Gilles Morin |- | style="background:whitesmoke;"|Nepean Total votes: 32,328 || |Hans Daigeler 13,723 (42.5%) | |Doug Collins 9,870 (30.5%) | |John Raudoy 7,453 (23.1%) | |Dan Roy (G)933 (2.9%) Dan Weiler (Lbt)349 (1.1%) || |Hans Daigeler |- | style="background:whitesmoke;"|Ottawa Centre Total votes: 30,446 | |Richard Patten 11,656 (38.3%) | |Alex Burney 2,723 (8.9%) || |Evelyn Gigantes 14,522 (47.7%) | |John Gay (FCP)809 (2.7%) Bill Hipwell (G)576 (1.9%)John Turmel (Ind)160 (0.5%) || |Richard Patten |- | style="background:whitesmoke;"| Ottawa East Total votes: 26,218 || |Bernard Grandmaître 16,363 (62.4%) | |Diana Morin 2,203 (8.4%) | |Lori Lucier 6,103 (23.3%) | |Richard Hudon (FCP)826 (3.2%) Frank de Jong (G)723 (2.7%) || |Bernard Grandmaître |- | style="background:whitesmoke;"|Ottawa—Rideau Total votes: 29,695 || |Yvonne O'Neill 13,454 (45.3%) | |Paul Beaudry 5,234 (17.6%) | |Larry Jones 8,845 (29.8%) | |Larry Denys (FCP)1,049 (3.5%) Jim MacPhee (Ind)861 (2.9%) Marc Schindler (Lbt)252 (0.8%) || |Yvonne O'Neill |- | style="background:whitesmoke;"|Ottawa South Total votes: 30,185 || |Dalton McGuinty 13,845 (45.9%) | |Darrel Kent 7,399 (24.5%) | |Margaret Armstrong 7,826 (25.9%) | |Stephen Johns (G)612 (2.0%) David Fitzpatrick (FCP)503 (1.7%) || |Dalton McGuinty, Sr. |- | style="background:whitesmoke;"|Ottawa West Total votes: 33,422 || |Bob Chiarelli 13,908 (41.6%) | |Brian Mackey 9,068 (27.1%) | |Allan Edwards 8,391 (25.1%) | |David Boyd (CoR)1,044 (3.1%) Ian Whyte (G) 1,011 (3.0%) || |Bob Chiarelli

Eastern Ontario

| style="background:whitesmoke;"|Cornwall Total votes: 27 347

|John Cleary 12 725 (46.5%) | |Don Kannon 3169 (11.6%) | |Leo Courville 7044 (26.5%) | |Carol-Ann Ross (CoR) 4409 (16.1%) || |John Cleary

| style="background:whitesmoke;"|Frontenac—Addington Total votes: 29,174 | |Larry South 8,226 (28.2%) | |Jim Bennett 8,211 (28.1%) || |Fred Wilson 9,696 (33.2%) | |Gail Leonard (FCP) 2,020 (6.9%) Ross Baker 1,021 (3.5%) || |Larry South |- | style="background:whitesmoke;"|Hastings—Peterborough Total votes: 28 282 | |Mike Beeston 4285 (15.2%) | |Jim Pollock 10 387 (36.7%) || |Elmer Buchanan 11 283 (39.9%) | |Anthony Kuttschrutter (FCP) 1199 (4.2%) Ronald Gerow (CoR) 1128 (4.0%) || |Jim Pollock |- | style="background:whitesmoke;"|Kingston and the Islands Total votes: 26 807 | |Ken Keyes 8092 (30.2%) | |John Goodchild 7079 (26.4%) || |Gary Wilson 10184 (38.0%) | |Joan Jackson (FCP) 1452 (5.4%) || |Ken Keyes |- | style="background:whitesmoke;"|Lanark—Renfrew Total votes: 34 060 | |Guin Persaud 9665 (28.4%) || |Leo Jordan 11 063 (32.5%) | |Harry Martin 8541 (25.1%) | |Murray Reid (CoR) 2938 (8.6%) Frank Foley (FCP) 1853 (5.4%) || |Douglas Wiseman |- | style="background:whitesmoke;"|Leeds–Grenville Total votes: 34 330 | |Chris Puddicombe 9172 (26.7%) || |Bob Runciman 16 846 (49.1%) | |Art Lane 8312 (24.2%)

|Bob Runciman |- | style="background:whitesmoke;"|Prescott and Russell Total votes: 39 833 || |Jean Poirier 25 879 (65.0%) | |Keith Flavell 2848 (7.1%) | |Carole Roy 9369 (23.5%) | |Paul Lauzon (FCP) 1119 (2.8%) Jean-Serge Brisson (Lbt) 618 (1.6%) || |Jean Poirier |- | style="background:whitesmoke;"|Prince Edward—Lennox Total votes: 27 752 | |Keith MacDonald 8188 (29.5%) | |Don Bonter 8299 (29.9%) || |Paul Johnson 9204 (33.2%) | |Kenn Hineman (CoR) 2061 (7.4%) || |Keith MacDonald |- | style="background:whitesmoke;"|Quinte Total votes: 29 691 || |Hugh O'Neil 11 114 (37.4%) | |Doug Rollins 5825 (19.6%) | |Greg Meehan 7010 (23.6%) | |Stu Meeks (CoR) 3411 (11.5%) Dave Switzer (FCP) 2331 (7.9%) || |Hugh O'Neil |- | style="background:whitesmoke;"|Renfrew North Total votes: 30 198 || |Sean Conway 13 082 (43.3%) | |Diane Yakabuski 4586 (15.2%) | |Ish Theilheimer 5916 (19.6%) | |Frank Adlam (CoR) 5510 (18.2%) Stephen Stanistreet (FCP) 1104 (3.7%) || |Sean Conway |- | style="background:whitesmoke;"|Stormont—Dundas—Glengarry and East Grenville Total votes: 29 082 | |Denis Sabourin 8386 (28.8%) || |Noble Villeneuve 11 887 (40.9%) | |Helena McCuaig 5357 (18.4%) | |Bernie Lauzon (CoR) 3452 (11.9%) || |Noble Villeneuve

Central Ontario

| style="background:whitesmoke;"|Bruce Total votes: 30,429

|Murray Elston 11,476 (37.7%) | |Terry Halpin 7,349 (24.2%) | |Len Hope 7,954 (26.2%) | |Linda Freiburger (FCP) 3,639 (12.0%) || |Murray Elston |- | style="background:whitesmoke;"|Dufferin—Peel Total votes: 31,447 | |Mavis Wilson 10 327 (32.8%) || |David Tilson 10,899 (34.7%) | |Sandra Crane 8,627 (27.4%) | |Bob Shapton (Lbt) 1,594 (5.1%) || |Mavis Wilson |- | style="background:whitesmoke;"|Bruce—Grey—Owen Sound Total votes: 38,056 | |Ron Lipsett 10,257 (27.0%) || |Bill Murdoch 13,742 (36.1%) | |Peggy Hutchinson 11,280 (29.6%) | |John Ross (FCP) 2,157 (5.7%) Don Cianci (G) 476 (1.3%) Oleh Stebelsky (Lbt) 144 (0.4%) || |Ron Lipsett |- | style="background:whitesmoke;"|Muskoka-Georgian Bay Total votes: 33 031 | |Ken Black 9105 (27.6%) | |Marilyn Rowe 10 504 (31.8%) || |Dan Waters 13 422 (40.6%)

|Ken Black |- | style="background:whitesmoke;"|Northumberland Total votes: 35 740

|Joan Fawcett 11 984 (33.5%) | |Angus Read 10 890 (30.5%) | |Judi Armstrong 9581 (26.8%) | |Doug Young (CoR) 1677 (4.7%) Steve Prust (FCP) 1213 (3.4%) John Meiboom (Lbt) 395 (1.1%) || |Joan Fawcett |- | style="background:whitesmoke;"|Peterborough Total votes: 41,888 | |Peter Adams 13,628 (32.5%) | |Doris Brick 8,884 (21.2%) || |Jenny Carter 13,813 (33.0%) | |John Harrington (FCP) 3,652 (8.7%) Dean Wasson (CoR) 1,586 (3.8%) Paul Cleveland (G) 325 (0.8%) || |Peter Adams |- | style="background:whitesmoke;"|Simcoe Centre Total votes: 41 572 | |Bruce Owen 12 869 (31.0%) | |Ben Andrews 10 013 (24.1%) || |Paul Wessenger 15 711(37.8%) | |Bonnie Ainsworth (CoR) 2979 (7.2%) || |Bruce Owen |- | style="background:whitesmoke;"|Simcoe East Total votes: 37 398 | |Jim Files 7219 (19.3%) || |Al McLean 14 828 (39.6%) | |Dennis Bailey 14 088 (37.7%) | |John McLean (Lbt) 1263 (3.4%) || |Al McLean |- | style="background:whitesmoke;"|Simcoe West Total votes: 32 089 | |Gary Johnson 7765 (24.2%) || |Jim Wilson 11 710 (36.5%) | |Leo Loserit 9870 (30.8%) | |James McGillivray (FCP) 2744 (8.6%) || |George McCague |- | style="background:whitesmoke;"|Victoria—Haliburton Total votes: 34 889 | |Patrick O'Reilly 7668 (22.0%) | |Ron Jenkins 8947 (25.6%) || |Dennis Drainville 15 467 (44.3%) | |Brad Medd (FCP) 1419 (4.1%) Hugh Boyd 971 (2.8%) Ron Hawkrigg (Lbt) 417 (1.2%) || |John Eakins

Durham & York Region

| style="background:whitesmoke;"|Durham Centre Total votes: 35,096 | |Allan Furlong 10,246 (29.2%) | |Jim Flaherty 9,126 (26.0%)

|Drummond White 12,594 (35.9%) | |Nino Maltese (FCP) 1,186 (3.4%) Phil Wyatt (CoR) 1,087 (3.1%) David Hubbell (G) 857 (2.4%) || |Allan Furlong |- | style="background:whitesmoke;"|Durham East Total votes: 33 476 | |Marilyn Pearce 7836 (23.4%) | |Kirk Kemp 10 907 (32.6%)

|Gord Mills 10 960 (32.7%) | |Tim Crookall (FCP) 2487 (7.4%) Harry Turnbridge (CoR) 1286 (3.8%) || |Sam Cureatz |- | style="background:whitesmoke;"|Durham West Total votes: 43,678 | |Norah Stoner 14,384 (32.9%) | |Rick Johnson 11,167 (25.6%)

|Jim Wiseman 16,366 (37.5%) | |Bert Vermeer (FCP) 1,761 (4.0%) || |Norah Stoner |- | style="background:whitesmoke;"|Durham—York Total votes: 36 284 | |Bill Ballinger 11 067 (30.5%) | |Jack Hauseman 10 904 (30.5%)

|Larry O'Connor 12 297 (33.9%) | |Jerry Young (FCP) 2016 (5.6%) || |Bill Ballinger |- | style="background:whitesmoke;"|Markham Total votes: 51 221 | |Frank Scarpitti 15 128 (29.5%) || |Don Cousens 25 595 (50.0%) | |Rob Saunders 8459 (16.5%) | |Eric Skura (FCP) 1086 (2.1%) Ian Hutchison (Lbt) 642 (1.3%) Gary Walsh 311 (0.6%) || |Don Cousens |- | style="background:whitesmoke;"|Oshawa Total votes: 27 173 | |Jim Carlyle 5116 (18.8%) | |Cliff Fillmore 3871 (14.2%) || |Allan Pilkey 16 601 (61.1%) | |Gary Jones (CoR) 1585 (5.8%) || |Michael Breaugh |- | style="background:whitesmoke;"|York Centre Total votes: 61 562 || |Greg Sorbara 28 056 (45.6%) | |Dion McGuire 14 656 (23.8%) | |Laurie Orrett 18 850 (30.6%)

|Greg Sorbara |- | style="background:whitesmoke;"|York—Mackenzie Total votes: 33,437 || |Charles Beer 11,452 (34.3%) | |George Timpson 11,304 (33.8%) | |Keith Munro 10,681 (31.9%)

|Charles Beer

Scarborough

| style="background:whitesmoke;"|Scarborough—Agincourt Total votes: 30 118 || |Gerry Phillips 13 347 (44.3%) | |Keith MacNab 8640 (28.7%) | |Ayoub Ali 6763 (22.5%) | |Bill Galster (Lbt) 1368 (4.5%) || |Gerry Phillips |- | style="background:whitesmoke;"|Scarborough Centre Total votes: 27,262 | |Cindy Nicholas 9,256 (34.0%) | |Joe Trentadue 5,682 (20.8%) || |Steve Owens 12,324 (45.2%)

|Cindy Nicholas |- | style="background:whitesmoke;"|Scarborough East Total votes: 32 915 | |Ed Fulton 9926 (30.2%) | |Steve Gilchrist 9890 (30.0%) || |Bob Frankford 11 700 (35.5%) | |Jim McIntosh (Lbt) 577 (1.8%) Cara Mumford (G) 454 (1.4%) Darryl McDowell 368 (1.1%) || |Ed Fulton |- | style="background:whitesmoke;"|Scarborough—Ellesmere Total votes: 29 119 | |Frank Faubert 9417 (32.3%) | |Greg Vezina 4855 (16.7%) || |David Warner 14 036 (48.2%) | |Kelvin Smith (Lbt) 811 (2.8%) || |Frank Faubert |- | style="background:whitesmoke;"|Scarborough North Total votes: 30 056 || |Alvin Curling 13 393 (44.6%) | |Harold Adams 5367 (17.9%) | |Victor Deane 9477 (31.5%) | |Louis Di Rocco (FCP) 1199 (4.0%) James Greig (G) 620 (2.1%) || |Alvin Curling |- | style="background:whitesmoke;"|Scarborough West Total votes: 28 027 | |Joe Pacione 6521 (23.3%) | |Jim Brown 5769 (20.6%) || |Anne Swarbrick 14 340 (51.2%) | |Stefan Slovak (FCP) 996 (3.6%) George Dance (Lbt) 401 (1.4%) || |Richard Johnston

North York & East York

| style="background:whitesmoke;"|Don Mills Total votes: 28,483 | |Murad Velshi 8,786 (30.8%) | |Nola Crewe 7,631 (26.8%) || |Margery Ward 9,740 (34.2%) | |David Miller (Lbt) 742 (2.6%) Katherine Mathewson (G) 608 (2.1%) Colin McKay 562 (2.0%) David Pengelly (F) 414 (1.5%) || |Murad Velshi |- | style="background:whitesmoke;"|Downsview Total votes: 23 755 | |Laureano Leone 8219 (34.6%) | |Chris Smith 1477 (6.2%) || |Anthony Perruzza 13 440 (56.6%) | |David Kenny (Lbt) 619 (2.6%) || |Laureano Leone |- | style="background:whitesmoke;"|Lawrence Total votes: 26 364 || |Joseph Cordiano 11 786 (44.7%) | |Henry Gallay 3557 (13.5%) | |Shalom Schachter 10 179 (38.6%) | |Sandor Hegedus (Lbt) 431 (1.6%) Paul Rombough (G) 411 (1.6%) || |Joseph Cordiano |- | style="background:whitesmoke;"|Oriole Total votes: 25 454 || |Elinor Caplan 10 655 (41.9%) | |Sam Billich 5435 (21.4%) | |Lennox Farrell 8441 (33.2%) | |Roland Brown (Lbt) 578 (2.3%) Greg Knittl (G) 345 (1.4%) || |Elinor Caplan |- | style="background:whitesmoke;"|Willowdale Total votes: 33,947 | |Gino Matrundola 11,123 (32.7%) || |Charles Harnick 11,957 (35.2%) | |Batya Hebdon 9,125 (26.9%) | |Mark Vosylius (FCP) 1,074 (3.2%) Earl Epstein (Lbt) 688 (2.0%) || |Gino Matrundola |- | style="background:whitesmoke;"|Wilson Heights Total votes: 27,725 || |Monte Kwinter 12,272 (44.3%) | |Steven Kerzner 4,913 (17.7%) | |John Fagan 9,618 (34.7%) | |Vanessa Schoor (G) 608 (2.2%) Roman Vrba (Lbt) 314 (1.1%) || |Monte Kwinter |- | style="background:whitesmoke;"|York East Total votes: 29 848 | |Christine Hart 9900 (33.2%) | |George Bryson 8021 (26.9%) || |Gary Malkowski 10 689 (35.8%) | |Jim Copeland 380 (1.3%) Bedora Bojman (G) 364 (1.2%) John Matthew (Lbt) 303 (1.0%) Chris Frazer (Comm) 191 (0.6%) ||