In the 2003 municipal elections in Ontario, voters in Ontario, Canada, elected mayors, councillors, school board trustees and all other elected officials in all of Ontario's municipalities.
According to the Association of Municipalities of Ontario, province-wide turnout for municipal elections in 2003 was 40.18% across 408 municipalities. This was down roughly 1%. 574 positions were acclaimed and 28 municipalities reported that their entire councils were acclaimed. In all, there were 5,103 candidates for 2,268 positions.
Here are results of mayoral races in selected cities in the civic elections held on November 10, 2003.
In a surprisingly active race (Toronto was the only city in the province with more mayoral candidates on the ballot), city councillor David Courtemanche emerged the victor over businessman Paul Marleau to succeed retiring mayor Jim Gordon.
| 2003 Greater Sudbury municipal election : Mayor of Greater Sudbury | ||||||||
|---|---|---|---|---|---|---|---|---|
| Candidate | Votes | % | ||||||
| David Courtemanche | 19,152 | 35.56 | ||||||
| Paul Marleau | 11,360 | 21.10 | ||||||
| Colin Firth | 8,096 | 15.03 | ||||||
| Louise Portelance | 5,645 | 10.48 | ||||||
| John Caruso | 4,693 | 8.71 | ||||||
| Tom Boyuk | 1,930 | 3.58 | ||||||
| Brian R. Gatien | 1,280 | 2.38 | ||||||
| Richard Doyon | 667 | 1.24 | ||||||
| Mary Fournier Pagnutti | 405 | 0.75 | ||||||
| David Chevrier | 271 | 0.50 | ||||||
| Yvonne Neison | 141 | 0.26 | ||||||
| Robert Maurice | 102 | 0.19 | ||||||
| Ed Pokonzie | 67 | 0.12 | ||||||
| David Popescu | 42 | 0.08 | ||||||
| Total valid votes | 53,851 | 100.00 | ||||||
In 2003, Guelph was the only major city in the province where both of the leading candidates for mayor were women.
See 2003 Hamilton municipal election
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First elected mayor in 1978, Hazel McCallion was easily reelected to her tenth term. As one of the longest serving politicians in the country, Mayor McCallion is well known to Mississaugans.
See: 2003 Norfolk County municipal election
Incumbent Ann Mulvale's narrow defeat of development skeptic Rob Burton had to be confirmed later in a judicial recount.
Incumbent mayor Nancy Diamond was defeated by challenger John Gray in a race that also hinged on economic and urban development; Gray was the pro-development candidate.
Incumbent Bob Chiarelli was reelected after facing an unexpectedly strong challenge from Terry Kilrea.
See: 2003 St. Catharines municipal election
Victor M. Power, Mayor of Timmins for 17 of the 20 years from 1980 to 2000, who did not stand in the 2000 municipal election, came out of retirement and was returned against one-term incumbent and the first female mayor of Timmins Jamie Lim.
David Miller was elected mayor defeating John Tory, Barbara Hall and John Nunziata. See also: 2003 Toronto municipal election Results of 2003 Toronto election
 Elections and referendums in Ontario | |
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| General elections | |
| Municipal elections | |
| Referendums | |
| Federal elections | |
