Elections were held in Northumberland County, Ontario, on October 25, 2010, in conjunction with municipal elections across the province.
| Position | Elected | |
|---|---|---|
| Mayor of Alnwick/Haldimand | Dalton McDonald | |
| Mayor of Brighton | Mark Walas | |
| Mayor of Cobourg | Gil Brocanier | |
| Mayor of Cramahe | Marc Coombs | |
| Mayor of Hamilton | Mark Lovshin | |
| Mayor of Port Hope | Linda M. Thompson | |
| Mayor of Trent Hills | Hector MacMillan |
| Mayoral Candidate http://www.alnwickhaldimand.ca/en/elections.asp?id=104 | Vote | % | |
|---|---|---|---|
| Dalton McDonald | 899 | ||
| Art Jeninga | 842 | ||
| Rosemarie Robins | 809 |
| Mayoral Candidate https://web.archive.org/web/20101026115249/http://brighton.ca/photos/custom/List%20of%20Certified%20Candidates%20-Sept%2013.pdf | Vote | % | |
|---|---|---|---|
| Mark Walas | 2,660 | ||
| Brian Ostrander | 2,239 |
| Mayoral Candidate http://www.cobourg.ca/images/stories/docs/Election%202010/Certified_list_of_candidatesSept132010RaceOrder.pdf | Vote | % | |
|---|---|---|---|
| Gil Brocanier | 4,408 | ||
| Manfred Schumann | 1,937 |
| Mayoral Candidate https://web.archive.org/web/20110706212432/http://visitcramahe.ca/cramahe/gov/list%20of%20nominations(5).pdf | Vote | % | |
|---|---|---|---|
| Marc Coombs (X) | 1,383 | ||
| Elie Dekeyser | 1,161 |
| Mayoral Candidate https://web.archive.org/web/20111006035640/http://www.porthope.ca/en/municipaldepartments/Elections.asp | Vote | % | |
|---|---|---|---|
| Linda M. Thompson (X) | 2467 | ||
| Robert T. Chatten | 156 | ||
| John B. Floyd | 1781 | ||
| William Spotton | 774 | ||
| Davidson Tate | 584 |
| Mayoral Candidate https://web.archive.org/web/20100730002820/http://www.trenthills.ca/en/services/election.asp?_mid_=6831 | Vote | % | |
|---|---|---|---|
| Hector MacMillan (X) | 3721 | ||
| Bob Fudge | 2282 |