CCGS John P. Tully is an offshore oceanographic science vessel in the Canadian Coast Guard operating out of Pacific Region at CGS Base Patricia Bay in Sidney, British Columbia. Prior to 1995, the ship was assigned to Fisheries and Oceans Canada. The vessel entered service in June 1985 with the Department of Fisheries and Oceans on the West Coast of Canada. In 1995, the fleets of Fisheries and Oceans and the Canadian Coast Guard were merged under Canadian Coast Guard command and John P. Tully became a Coast Guard vessel. John P. Tully has been employed on joint research voyages with a variety of United States agencies, including the National Oceanic and Atmospheric Administration.