The 1972 Toronto municipal election was held December 4, 1972, to elect the governments of Toronto, Ontario, Canada, the five other boroughs, and the government of Metro Toronto as well.
The election was overshadowed by the 1972 federal election held October 30 and the American elections held November 7, but it resulted in a dramatic change in the city government. Four new mayors were elected, and 17 of 32 Metro seats were held by newcomers. In the City of Toronto, control of city council was won by the reform faction and reform leader David Crombie was elected mayor.
As in the 1969 election many of the central debates were over proposed megaprojects. The Spadina Expressway had been halted in 1971, but some wanted it built. The debate over the Scarborough Expressway was also one of the central issues in the east end.
An IBM 370-155 was used by the Star to process the results.
Incumbent mayor William Dennison chose not to turn for reelection. The three main candidates vying to replace him were city councillors David Rotenberg, David Crombie, and Tony O'Donohue. O'Donohue and Rotenberg were veteran councillors. Rotenberg had been on council ten years and had served as Deputy Mayor. He also won the endorsement of the Toronto Star. Crombie had been elected to city council only three years earlier, previously serving as a professor at Ryerson Polytechnic Institute. He was a moderate member of the reform faction on council, willing to compromise with the Old Guard. A fourth notable candidate was Toronto Sun columnist Paul Rimstead, who ran a semi-serious campaign based on law and order policies.