The Progressive Conservative Party of Ontario fielded a full slate of 103 candidates in the 2003 Ontario general election. The party, which had been in power since 1995, won twenty-four seats to become the official opposition in the sitting of the legislature that followed.
Candidates
{| class="wikitable sortable" width="100%"
|-
!Riding
!Candidate's Name
!Occupation
!Votes
!%
!Rank
!Notes
|-
|Algoma—Manitoulin
|
|
|5,168
|17.33
|3rd
|
|-
|Ancaster—Dundas—Flamborough—Aldershot
|
|
|18,141
|37.42
|2nd
|Ran for the Reform Party in Hamilton—Wentworth in the 1993 Canadian federal election.
|-
|Barrie—Simcoe—Bradford
|
|
|31,529
|51.78
|1st
|Incumbent
|-
|Beaches—East York
|
|Registered Nurse
|8,157
|19.67
|3rd
|Later chaired the Toronto Catholic District School Board on two occasions.
|-
|Bramalea—Gore—Malton—Springdale
|
|
|15,549
|36.73
|2nd
|Incumbent
|-
|Brampton Centre
|
|
|15,656
|40.86
|2nd
|Incumbent
|-
|Brampton West—Mississauga
|
|
|26,414
|42.17
|2nd
|Incumbent; Minister of Health and Long-Term Care
|-
|Brant
|
|
|13,618
|30.65
|2nd
|Ran in the same division in the 1999 Ontario general election.
|-
|Bruce—Grey—Owen Sound
|
|
|23,338
|52.07
|1st
|Incumbent
|-
|Burlington
|
|
|21,506
|46.15
|1st
|Incumbent; resigned seat on 28 September 2006
|-
|Cambridge
|
|
|19,996
|42.50
|1st
|Incumbent
|-
|Chatham-Kent—Essex
|
|
|11,586
|29.82
|2nd
|
|-
|Davenport
|
|
|1,977
|7.46
|3rd
|
|-
|Don Valley East
|
|
|12,027
|32.03
|2nd
|
|-
|Don Valley West
|
|
|17,394
|38.95
|2nd
|Incumbent; Associate Minister of Enterprise, Opportunity and Innovation
|-
|Dufferin—Peel—Wellington—Grey
|
|
|29,222
|56.64
|1st
|Incumbent; party leader and Premier of Ontario; resigned seat on 1 February 2005
|-
|Durham
|
|
|23,814
|47.09
|1st
|Incumbent
|-
|Eglinton—Lawrence
|
|
|12,402
|29.72
|2nd
|
|-
|Elgin—Middlesex—London
|
|
|13,149
|30.25
|2nd
|
|-
|Erie—Lincoln
|
|
|20,348
|48.49
|1st
|Incumbent; Minister of Consumer and Business Services
|-
|Essex
|
|
|11,234
|24.74
|3rd
|
|-
|Etobicoke Centre
|
|
|17,610
|39.43
|2nd
|
|-
|Etobicoke—Lakeshore
|
|
|14,524
|32.59
|2nd
|Incumbent
|-
|Etobicoke North
|
|
|6,978
|22.52
|2nd
|
|-
|Glengarry—Prescott—Russell
|
|
|10,921
|24.88
|2nd
|
|-
|Guelph—Wellington
|
|
|20,735
|37.08
|2nd
|Incumbent; Minister of Community, Family and Social Services
|-
|Haldimand—Norfolk—Brant
|
|
|20,109
|46.10
|1st
|Incumbent
|-
|Haliburton—Victoria—Brock
|
|
|24,297
|47.41
|1st
|
|-
|Halton
|
|
|33,610
|48.20
|1st
|Incumbent
|-
|Hamilton East
|
|
|4,033
|13.13
|3rd
|
|-
|Hamilton Mountain
|
|
|8,637
|19.02
|3rd
|
|-
|Hamilton West
|
|
|8,185
|20.97
|3rd
|
|-
|Hastings—Frontenac—Lennox and Addington
|
|Auctioneer
|13,709
|33.01
|2nd
|Member of the Pittsburgh Township council from 1980 to 1988 and reeve from 1989 to 1994.<br>Ran for the Progressive Conservative Party in Kingston and the Islands in the 1993 Canadian federal election.
|-
|Huron—Bruce
|
|
|16,594
|38.23
|2nd
|Incumbent; Minister of Agriculture and Food
|-
|Kenora—Rainy River
|
|
|3,343
|12.83
|3rd
|
|-
|Kingston and the Islands
|
|
|9,640
|20.12
|2nd
|
|-
|Kitchener Centre
|
|
|16,120
|37.57
|2nd
|Incumbent
|-
|Kitchener—Waterloo
|
|
|23,957
|43.08
|1st
|Incumbent; Deputy Premier of Ontario and Minister of Education
|-
|Lambton—Kent—Middlesex
|
|
|15,060
|36.66
|2nd
|Incumbent
|-
|Lanark—Carleton
|
|
|29,641
|48.99
|1st
|Incumbent; Attorney General and Minister responsible for Native Affairs
|-
|Leeds—Grenville
|
|
|21,443
|48.70
|1st
|Incumbent; Minister of Public Safety and Security
|-
|London—Fanshawe
|
|
|11,777
|30.35
|3rd
|Incumbent
|-
|London North Centre
|
|
|13,460
|28.92
|2nd
|Incumbent; Minister of Training, Colleges and Universities and Minister responsible for Women's Issues
|-
|London West
|
|
|15,463
|31.11
|2nd
|Incumbent
|-
|Markham
|
|
|21,257
|40.33
|2nd
|Incumbent; Minister of Culture
|-
|Mississauga Centre
|
|
|15,846
|40.72
|2nd
|Incumbent
|-
|Mississauga East
|
|
|13,832
|40.35
|2nd
|Incumbent; Minister of Citizenship and Minister responsible for Senior Citizens
|-
|Mississauga South
|
|
|16,977
|43.20
|2nd
|Incumbent
|-
|Mississauga West
|
|
|20,406
|37.18
|2nd
|
|-
|Nepean—Carleton
|
|
|31,662
|54.06
|1st
|Incumbent; Government House Leader and Minister of Energy; resigned seat on 29 November 2005
|-
|Niagara Centre
|
|
|12,526
|26.70
|3rd
|
|-
|Niagara Falls
|
|
|15,353
|38.06
|2nd
|Incumbent
|-
|Nickel Belt
|
|
|4,804
|13.49
|3rd
|
|-
|Nipissing
|
|
|14,978
|41.47
|2nd
|Incumbent
|-
|Northumberland
|
|
|17,816
|39.37
|2nd
|Incumbent; Chief Government Whip and Minister without Portfolio
|-
|Oak Ridges
|
|
|32,647
|47.27
|1st
|Incumbent; Minister of Transportation
|-
|Oakville
|
|
|18,991
|42.18
|2nd
|
|-
|Oshawa
|
|
|14,566
|37.32
|1st
|Incumbent; Minister of Natural Resources
|-
|Ottawa Centre
|
|Policy Advisor
|11,217
|22.69
|3rd
|Spouse of Lisa MacLeod
|-
|Ottawa—Orléans
|
|
|20,762
|41.32
|2nd
|Incumbent; Minister of Tourism and Recreation
|-
|Ottawa South
|
|
|16,413
|34.43
|2nd
|
|-
|Ottawa—Vanier
|
|
|10,878
|26.24
|2nd
|Ran in the same division in the 1999 Ontario general election.
|-
|Ottawa West—Nepean
|
|
|20,277
|41.24
|2nd
|Incumbent
|-
|Oxford
|
|
|18,656
|44.06
|1st
|Incumbent; Associate Minister of Municipal Affairs and Housing with responsibility for Rural Affairs
|-
|Parkdale—High Park
|
|
|6,436
|16.18
|2nd
|
|-
|Parry Sound—Muskoka
|
|
|18,776
|48.51
|1st
|Incumbent
|-
|Perth—Middlesex
|
|
|15,680
|39.36
|2nd
|Incumbent
|-
||Peterborough
|
|
|18,418
|33.46
|2nd
|Incumbent
|-
|Pickering—Ajax—Uxbridge
|
|
|23,960
|43.91
|2nd
|Incumbent; Minister of Finance
|-
|Prince Edward—Hastings
|
|
|12,800
|32.02
|2nd
|
|-
|Renfrew—Nipissing—Pembroke
|
|
|19,274
|44.14
|1st
|
|-
|Sarnia—Lambton
|
|
|11,852
|30.99
|2nd
|
|-
|Sault Ste. Marie
|
|
|2,674
|7.61
|3rd
|
|-
|Scarborough—Agincourt
|
|
|11,337
|30.08
|2nd
|
|-
|Scarborough Centre
|
|
|11,686
|28.04
|2nd
|Incumbent
|-
|Scarborough East
|
|
|14,323
|33.84
|2nd
|Incumbent
|-
|Scarborough—Rouge River
|
|
|9,468
|25.21
|2nd
|
|-
|Scarborough Southwest
|
|
|11,826
|31.71
|2nd
|Incumbent; Associate Minister of Health and Long-Term Care
|-
|Simcoe—Grey
|
|
|26,114
|51.47
|1st
|Incumbent; Minister of Northern Development and Mines and Minister of Environment
|-
|Simcoe North
|
|
|23,393
|46.13
|1st
|Incumbent
|-
|St. Catharines
|
|Regional Councillor
|12,932
|29.34
|2nd
|
|-
|St. Paul's
|
|
|11,203
|24.65
|2nd
|
|-
|Stoney Creek
|
|
|19,517
|38.58
|2nd
|Incumbent; Minister of Labour
|-
|Stormont—Dundas—Charlottenburgh
|
|
|13,948
|36.50
|2nd
|
|-
|Sudbury
|
|Executive Director
|5,068
|14.19
|2nd
|Ran in the same division in the 1999 Ontario general election.<br>Also ran for the Greater Sudbury municipal council in the 2000 Greater Sudbury municipal election.
|-
|Thornhill
|
|
|20,623
|45.16
|2nd
|Incumbent; Associate Minister of Municipal Affairs and Housing with responsibility for Urban Affairs
|-
|Thunder Bay—Atikokan
|
|
|5,365
|17.62
|3rd
|
|-
|Thunder Bay—Superior North
|
|
|2,912
|9.62
|3rd
|
|-
|Timiskaming—Cochrane
|
|
|6,330
|20.38
|2nd
|
|-
|Timmins—James Bay
|
|
|2,527
|8.41
|3rd
|
|-
|Toronto Centre—Rosedale
|
|
|9,968
|22.04
|2nd
|
|-
|Toronto—Danforth
|
|
|6,562
|16.95
|3rd
|
|-
|Trinity—Spadina
|
|
|4,985
|12.29
|3rd
|
|-
|Vaughan—King—Aurora
|
|
|21,744
|33.06
|2nd
|
|-
|Waterloo—Wellington
|
|
|22,550
|48.97
|1st
|Incumbent
|-
|Whitby—Ajax
|
|
|27,240
|48.33
|1st
|Incumbent; Minister of Enterprise, Opportunity and Innovation; resigned seat in November 2005
|-
|Willowdale
|
|
|19,957
|42.95
|2nd
|Incumbent; Minister of Municipal Affairs and Housing
|-
|Windsor—St. Clair
|
|Marketing Coordinator
|4,162
|11.61
|3rd
|
|-
|Windsor West
|
|
|4,187
|11.90
|3rd
|Ran in Ottawa West in 1987 Ontario general election.
|-
|York Centre
|
|
|7,862
|24.83
|2nd
|
|-
|York North
|
|
|24,517
|47.19
|1st
|Incumbent
|-
|York South—Weston
|
|
|4,930
|15.23
|3rd
|
|-
|York West
|
|
|2,330
|10.03
|3rd
|
|-
|}
Candidates in by-elections held between 2003 and 2007
{| class="wikitable sortable" width="100%"
|-
!Date
!Riding
!Candidate's Name
!Occupation
!Votes
!%
!Rank
!Notes
|-
|2004 05 13
|Hamilton East
|
|
|1,772
|7.42
|3rd
|
|-
|2005 03 17
|Dufferin—Peel—Wellington—Grey
|
|
|15,893
|56.67
|1st
|Party leader
|-
|2005 11 25
|Scarborough—Rouge River
|
|
|4,268
|25.86
|2nd
|
|-
|2006 03 30
|Nepean—Carleton
|
|
|17,312
|57.57
|1st
|
|-
|2006 03 30
|Scarborough—Rouge River
|
|
|2,740
|10.03
|3rd
|
|-
|2006 03 30
|Whitby—Ajax
|
|
|15,799
|46.21
|1st
|
|-
|2006 09 14
|Parkdale—High Park
|
|
|4,943
|17.33
|3rd
|
|-
|2007 02 08
|Burlington
|
|
|11,146
|49.00
|1st
|
|-
|2007 02 08
|Markham
|
|
|6,426
|34.89
|2nd
|
|-
|2007 02 08
|York South—Weston
|
|
|1,917
|10.18
|3rd
|
|-
|}
Source for election results: Election Results, Elections Ontario, accessed 2 November 2021.