Tom Long (born 1958) is a lawyer and political activist. He is a director of the Manning Centre for Building Democracy. He chaired former Ontario premier Mike Harris’s victorious 1995 and 1999 election campaigns and was one of the authors of Harris' Common Sense Revolution platform. Long was president of the Progressive Conservative Party of Ontario from 1986 to 1989. Long co-chaired the founding convention of the Canadian Alliance in January 2000 and was a candidate for the party's leadership later that year placing third with 18.16% of the vote.