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.

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 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.