HMCS Regina was a Royal Canadian Navy revised Flower-class corvette which took part in convoy escort duties during the Second World War.

[2][3][4] 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.

They also came with heavier secondary armament with 20 mm anti-aircraft guns carried on the extended bridge wings.

[10] After commissioning and workups, Regina was assigned to the Western Local Escort Force (WLEF) in mid-March.

On 3 July 1942 Regina rescued 25 survivors of the American merchant SS Alexander Macomb which was sunk east of Cape Cod.

[9] She returned to Canada in late March 1943 and briefly rejoined WLEF before departing for a refit in June.

[10] On 8 August 1944, Regina was torpedoed and sunk by U-667 8 nautical miles (15 km) north of Trevose Head on the coast of Cornwall at 50°42′N 5°3′W / 50.700°N 5.050°W / 50.700; -5.050 while rescuing survivors of the American merchant Liberty ship Ezra Weston.

The exploration of these wrecks by a crew of researchers was the subject of an episode of the television documentary series "Deep Sea Mysteries".