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

She was originally laid down by the Royal Navy as HMS Bullrush but was never commissioned into the RN, being transferred to the RCN before completion.

[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] Bullrush was ordered 15 May 1942 as part of the Royal Navy 1942–43 Increased Endurance Flower-class building program.

[11] The only significant differences between the RCN and RN 1942–43 Flower classes was a shortened mainmast and varying anti-aircraft armament.