CCGS Hudson[a] was an offshore oceanographic and hydrographic survey vessel operated by the Canadian Coast Guard.

The first Canadian ship built specifically for hydrographic and oceanographic survey work, Hudson was designed by the Montreal firm of Gilmore, German and Milne.

The propulsion system, rated at 6,469 kilowatts (8,675 hp), drives two fixed pitch propellers and bow thrusters, giving the ship a maximum speed of 17 knots (31 km/h; 20 mph).

[2] During the 1960s, Hudson performed five surveys of the Mid-Atlantic Ridge as part of the world-wide study of continental drift.

[4] While transiting, the ship carried out several experiments, among them studies of marine life along the east coast of the Americas, tidal current surveys of Chilean fjords and geographic discoveries in the Pacific Ocean.

[1] In March 1976, Hudson rescued the entire crew of the fishery patrol vessel Cape Freels, which had been abandoned on the Grand Banks of Newfoundland after catching fire.

[1] Hudson contributed significantly during recovery operations during the aftermath of the semi-submersible mobile offshore drilling unit Ocean Ranger that sank in Eastern Canadian waters on 15 February 1982.

Hudson saved all 24 crew members of MV Skipper 1 in the North Atlantic on 29 April 1987.

When Hudson arrived on scene, they found the tanker Athenian Venture on fire and in two pieces.

[1] In 2007 the Government of Canada announced several new shipbuilding projects for the Canadian Coast Guard, including a replacement for Hudson, expected to be in service by 2012.

[10] The ship rescued the seven-man crew of the fishing vessel Ocean Commander which burned and sank on 6 July 2009.

[14] Hudson returned to the East Coast on 14 November 2017 to ensure that the ship was out of the Saint Lawrence Seaway before it closed.