HMCS Moose Jaw was a Royal Canadian Navy Flower-class corvette which took part in convoy escort duties during World War II.

[3][4][5] The "corvette" designation was created by the French as a class of small warships; the Royal Navy borrowed the term for a period but discontinued its use in 1877.

On 10 September 1941, Moose Jaw along with Chambly sank U-501 by depth charges and ramming in the Denmark Strait south of Tasiilaq, Greenland.

[10][11] On the 11 September 1941 Moose Jaw and Kenogami rescued 41 survivors from the British merchant ship Berury, which had been torpedoed and sunk by the German submarine U-207 east of Cape Farewell, Greenland.

[10] Moose Jaw needed ten days repairs at Greenock due to the damage done while ramming U-501.

Upon completion of those, Moose Jaw spent the next four months escorting convoys between St. John's and Iceland.

After workups, she was briefly assigned to the Western Local Escort Force before being sent across to the United Kingdom as part of Canada's contribution to Operation Torch in September.

Moose Jaw spent the next five months escorting convoys between the United Kingdom and Gibraltar.

After workups following the refit, Moose Jaw was assigned to Western Approaches Command, as part of Operation Neptune.

[11] On 28 February 1945 Moose Jaw rescued six survivors from the British merchant ship Norfolk Coast, which was torpedoed and sunk by U-1302 south-west of Strumble Head.

In one very serious battle, that connected with the convoy SC 42, it happened that two of my Newfoundland vessels had a week to spare and they were allowed to go on a training jaunt along the possible convoy routes in the vicinity of the East coast of Greenland, where U-boats were liable to be found, and by good luck, were in a position to reinforce the escort group involved.