John McCallum (9 April 1950 – 21 June 2025) was a Canadian politician, economist, diplomat and university professor. A onetime Liberal Member of Parliament (MP), McCallum served as the Canadian Ambassador to China from 2017 until being asked to resign by Prime Minister Trudeau in 2019. As an MP, he represented the electoral district of Markham—Thornhill and had previously represented Markham—Unionville and Markham.
