Mark Rudolph MacGuiganPC (17 February 1931 – 12 January 1998) was aCanadian academic andpolitician.

Born inCharlottetown, Prince Edward Island, the son ofMark Rudolph MacGuigan and Agnes Violet Trainor,^[1] he was educated atSaint Dunstan's University (B.A.), theUniversity of Toronto (M.A., Ph.D. (Philosophy)),Osgoode Hall Law School (LL.B.), andColumbia University (LL.M., J.S.D.)^[2] He was a professor at Osgoode and the University of Toronto and was dean of law at theUniversity of Windsor.

MacGuigan was elected as aLiberal Party candidate to theHouse of Commons of Canada in the1968 general election. He was re-elected in1972,1974,1979, and1980.

In 1976, he took a turn at provincial politics and ran for the leadership of theOntario Liberal Party. He lost toStuart Smith at theleadership convention.

In 1980, he was appointedSecretary of State for External Affairs in thecabinet ofPrime MinisterPierre Trudeau. He becameMinister of Justice and Attorney General of Canada in 1982.

When Trudeau announced his retirement as Liberal leader and prime minister, MacGuigan ran to succeed him at the1984 Liberal leadership convention. He placed fifth. He retired from politics following the convention, and became ajudge on the federalCourt of Appeal.

He died inOklahoma City ofliver cancer in 1998.

• P. Whitney Lackenbauer, ed. (2002).An Inside Look at External Affairs during the Trudeau Years: The Memoirs of Mark MacGuigan. University of Calgary Press.ISBN 1-55238-076-9.

• Mark MacGuigan – Parliament of Canada biography

• 1931 births
• 1998 deaths
• Lawyers in Ontario
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• Politicians from Windsor, Ontario
• Politicians from Charlottetown
• Canadian secretaries of state for external affairs
• Prince Edward Island candidates for Member of Parliament
• 20th-century members of the House of Commons of Canada

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