The Kellock–Taschereau Commission (officially the Royal Commission to Investigate the Facts Relating to and the Circumstances Surrounding the Communication, by Public Officials and Other Persons in Positions of Trust of Secret and Confidential Information to Agents of a Foreign Power) was a royal commission appointed by Prime Minister William Lyon Mackenzie King on behalf of the Government of Canada under Order in Council PC 411 on 5 February 1946 to investigate the "Gouzenko Affair", allegations set forward by Soviet defector Igor Gouzenko that a spy ring of Canadian Communists was handing over secret information to the Soviet Union. Notable among the thirteen accused of passing over secrets were Fred Rose, the Labor-Progressive Party Member of Parliament for Cartier, and Sam Carr, a senior organizer of the Labor-Progressive Party. The commission was headed by two judges of the Supreme Court of Canada, Justice Robert Taschereau and Justice Roy Kellock. Counsel included President of the Canadian Bar Association E.K. Williams, D.W. Mundell, Gérald Fauteux, and John Robert Cartwright.
The Commission was hurriedly convened when rumours in Washington suggested journalist Drew Pearson was about to disclose that Canada was secretly investigating Russian spy rings that might extend into the USA. Several Canadians named in Gouzenko's documents were immediately arrested and sequestered until summoned before the royal commission.