Roy Cullen, PC (born December 30, 1944, in Montreal, Quebec) is a former politician who was a Liberal MP for the riding of Etobicoke North in the House of Commons of Canada.
In 1999 he was appointed Parliamentary Secretary to the Minister of Finance, and was re-appointed following the 2000 general election.
In the leadership contest called to replace Paul Martin as leader of the Liberal Party, he initially supported Maurizio Bevilacqua and subsequently supported Michael Ignatieff when Bevilacqua withdrew from the race.
In opposition, Cullen broke with the Liberal caucus in 2007 to vote with Stephen Harper's Conservative government in favour of extending Canada's NATO-authorized combat mission in the Kandahar province of Afghanistan for two years.
[1] In 2008, Cullen also received publicity for allegedly stating in caucus that he would defy Liberal Party leader Stéphane Dion's whip by voting again with the Conservative Government in further extending the combat mission indefinitely.