The Bittern-class sloop was a three-ship class of long-range escort vessels used in the Second World War by the Royal Navy.

The Bittern class were built as light, long-range escort ships with limited anti-air capability.

Stork was unarmed on completion, but with provision for six 4-inch guns, plus AA and ASW weaponry; she served as a survey vessel in the Far East.

Enchantress served as convoy escort throughout the war, and was credited with the destruction of an Italian submarine.

Stork was completed as an unarmed survey vessel, and was only armed after the outbreak of war.