HMCS Wolf was an armed yacht of the Royal Canadian Navy during World War II that saw service on the British Columbia Coast of Canada.

Constructed in 1915 as the yacht Wenowah, with the US entry into World War I, the vessel was taken into United States Navy service as USS Wenonah (SP-165) as a patrol ship.

After the war, Wenonah was loaned to the United States Coast and Geodetic Survey for three and a half years before being sold to private interests in 1928.

With the onset of World War II, the Royal Canadian Navy sought vessels capable of patrol duties.

With the US entry into World War I, the United States Navy (USN) sought out ships for its section patrol and acquired Wenonah from Walter G.

[1] Wenonah departed Newport, Rhode Island with five other patrol ships and a tender, towing submarine chasers to Gibraltar via Bermuda and the Azores.

Members of the submarine′s crew then appeared on deck and waved their arms, and the convoy′s escorts discovered that she was the French Navy submarine Watt.

A joint court of inquiry into the friendly fire incident with one American, two British, and two French naval officers as members took place at Gibraltar and found no one to blame.

Another joint court of inquiry consisting of two British and two French naval officers took place at Bizerte, and also found no one to blame, concluding that Watt had disobeyed orders governing submarines operating in the area.

Once again Wenonah dropped a depth charge, but this time it failed to detonate and the patrol ship turned to rescue work, recovering 38 of Rutherglen's crew.

During the rest of the convoy's voyage Wenonah dropped several more depth charges and fired a 3-inch (76.2 mm) shell at suspected contacts, but no further engagement with the enemy was had before the end of the journey.

[1][4] To augment the local sea defences of coastal ports, the Royal Canadian Navy (RCN) sought large, steel-hulled yachts to requisition.

The yacht, Blue Water, was deemed acceptable after an investigation and Keenleyside sought the government's permission to purchase the vessel.