Harold Hugh MacKay, OC QC (born August 1, 1940) is a Canadian lawyer and corporate director.
He joined the Western Canada law firm of MacPherson Leslie & Tyerman LLP as an Associate in 1963, becoming Partner in 1969, Managing Partner in 1989, and Chairman in 1997.
From 1997 to 1998, he chaired the Task Force on the Future of the Canadian Financial Services Sector.
From 2002 to 2003, he was the Clifford Clark Visiting Economist, a key advisory position for Canada's Department of Finance .
This Canadian biographical article relating to law is a stub.