Elections were held in Northumberland County, Ontario, on October 25, 2010, in conjunction with municipal elections across the province.

Northumberland County Council Position ElectedMayor of Alnwick/Haldimand Dalton McDonald Mayor of Brighton Mark Walas Mayor of Cobourg Gil BrocanierMayor of Cramahe Marc Coombs Mayor of Hamilton Mark Lovshin Mayor of Port Hope Linda M. ThompsonMayor of Trent Hills Hector MacMillan

Alnwick/Haldimand Mayoral Candidate Vote % Dalton McDonald 899 Art Jeninga 842 Rosemarie Robins 809

Brighton Mayoral Candidate Vote % Mark Walas 2,660 Brian Ostrander 2,239

Cobourg Mayoral Candidate Vote % Gil Brocanier 4,408 Manfred Schumann 1,937

Cramahe Mayoral Candidate Vote % Marc Coombs (X) 1,383 Elie Dekeyser 1,161

Hamilton Mayoral Candidate Vote % Mark Lovshin (X) Acclaimed

Port Hope Mayoral Candidate Vote % Linda M. Thompson (X) 2467 Robert T. Chatten 156 John B. Floyd 1781 William Spotton 774 Davidson Tate 584

Trent Hills Mayoral Candidate Vote % Hector MacMillan (X) 3721 Bob Fudge 2282