Michael Patrick "Mickey" Hennessy (August 8, 1915 — March 5, 1991) was a boxer and politician in Ontario, Canada.
He served in the Legislative Assembly of Ontario from 1977 to 1987, as a member of the Progressive Conservative Party.
He lost his provincial seat in the 1987 election, falling to Liberal Lyn McLeod by 1,463 votes.
[4] Hennessy campaigned for re-election to the Thunder Bay City Council in 1988, and won more votes than any other candidate.
Mike Harris, then leader of the Progressive Conservative Party, credited Hennessy with bringing "a touch of the common person back to the caucus discussions".