John Christopher Milloy (born June 29, 1965 in Kitchener, Ontario, Ontario) is a politician in Ontario, Canada. He is currently a member of the Legislative Assembly of Ontario, representing the riding of Kitchener Centre for the Liberal Party.

Milloy has a Bachelor of Arts degree from Carleton University, a Master of Arts degree in International History from the London School of Economics, and a Doctorate in Modern History from Oxford University. Before his election, he worked at the Centre for International Governance Innovation in Waterloo, Ontario. He was a legislative assistant to Canadian Prime Minister Jean Chrétien from 1997 to 2002, and has also worked as an assistant to Stéphane Dion, John Manley and Yvonne O'Neill.

He won the Liberal nomination in Kitchener Centre on February 2, 2003, and defeated incumbent Progressive Conservative Wayne Wettlaufer by about 2000 votes in the provincial election held later in the year. Given his experience working with federal politicians, it was not a great surprise when, on October 23, 2003, Milloy was named parliamentary assistant to Premier Dalton McGuinty in the latter's secondary capacity as the Ontario Minister of Intergovernmental Affairs .

(Note: There is another John Milloy in Ontario, a professor at Trent University who has recently written an historical exposé of Canada's residential school system.)