R. Peter MacKinnon, OC KC (born 1947) is a Canadian lawyer and legal academic. MacKinnon served as the president of the University of Saskatchewan from 1999 to 2012. On 1 July 2014, he was named as the interim president of Athabasca University. On 15 January 2019, MacKinnon started serving as interim president of Dalhousie University upon the resignation of Richard Florizone and served until the announcement of the next president, Deep Saini.