HMCS Orillia was a Flower-class corvette that served with the Royal Canadian Navy during the Second World War.

[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.

[6] During the hurried preparations for war in the late 1930s, Winston Churchill reactivated the corvette class, needing a name for smaller ships used in an escort capacity, in this case based on a whaling ship design.

[9] Ordered 1 February 1940 as part of the 1939–1940 Flower-class building program, Orillia was laid down by Collingwood Shipyards on 4 March 1940.

During the running battle the Orillia dropped back to pick up survivors and eventually stood by the damaged tanker Tahchee and towed her to Iceland.

Upon completion of the refit she joined Escort Group (EG) C-1 and was sent to work up at Tobermory for three weeks.