HMAS Kookaburra (A331) was a Net-class boom defence vessel of the Royal Australian Navy (RAN), which served during World War II.

[2] Originally used as boom defence ship and anti-submarine training vessel in Sydney, Kookaburra was transferred to Darwin in April 1940.

[2] The ship served as a boom defense and examination vessel in Darwin, and remained there until the end of World War II, with the exception of a refit in Brisbane between September 1942 and February 1943.

[3][4] On 15 January 1946, Kookaburra was paid off into reserve, was briefly recommissioned for a voyage to Sydney in 1950, and underwent conversion to a "Special Duties Vessel".

[2] During this visit, a paperboy delivering to the ship fell overboard and was rescued by two personnel from Kookaburra.