All municipalities in the Canadian province of Ontario held elections on November 13, 1978, to elect mayors or reeves, councillors, school trustees, and (in some areas) public utilities commissioners. Some municipalities also held referendums on various issues.

The most closely watched contest was in Toronto, where John Sewell was elected as mayor.

Elected mayors and reeves Ajax: Clark Mason Barrie: Ross Archer Belleville: J. Ben Corke Brampton: Jim Archdekin Brantford: Charles Bowen (details) Brockville: Robert Sheridan Burlington: Roly Bird Caledon: John Clarkson Cambridge: Claudette Millar Chatham: Curtis Carter Cornwall: Gerald Parisien Dundas: Joe Bennett East York: Alan Redway (details) Etobicoke: Dennis Flynn (details) Flamborough: Betty Ward Fort Erie: Stella Ziff Georgina: Joe Dales Gloucester: Betty Stewart (details) Grimsby: Bob Arkell Guelph: Norm Jary Haldimand: David Peirson Halton Hills: Pete Pomeroy Hamilton: Jack MacDonald Kingston: Ken Keyes Kingston (Township): Peter Beeman Kitchener: Morley Rosenberg London: Al Gleeson Markham: Tony Roman Milton: Don Gordon Mississauga: Hazel McCallion (details) Nanticoke: George Dmetriuc Nepean: Ben Franklin (details) Newcastle: Garnet Rickard Newmarket: Bob Forhan Niagara Falls: Wayne Thomson North Bay: Merle Dickerson North York: Mel Lastman (details) Oakville: Harry Barrett Orillia: Dave Macdonald Oshawa: Jim Potticary Ottawa: Marion Dewar (details) Owen Sound: Bob Rutherford Peterborough: Cam Wasson Pickering: Jack Anderson Port Colborne: Bob Saracino Rayside-Balfour: Gilles Pelland Richmond Hill: Dave Schiller Sarnia: Andy Brandt Sault Ste. Marie: Nick Trbovich Scarborough: Gus Harris (details) St. Catharines: Roy Adams Stoney Creek: Gordon Dean Stratford: Ted Blowes St. Thomas: Donald Hitch Sudbury: Jim Gordon Thunder Bay: Dusty Miller Timmins: Michael Doody Toronto: John Sewell (details) Trenton: Duncan McDonald Valley East: Howard Armstrong Vanier: Bernard Grandmaître (details) Vaughan: Garnet Williams Waterloo: Marjorie Carroll Welland: Eugene Stranges Whitby: Jim Gartshore Windsor: Bert Weeks Woodstock: Wendy Calder Woolwich: Ken Seiling York: Gayle Christie(details)

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