HMAS Karangi was a Kangaroo-class boom defence vessel operated by the Royal Australian Navy (RAN) during World War II. The third of three ships constructed by the Cockatoo Docks and Engineering Company at Cockatoo Island Dockyard based on the British Bar-class, Karangi was launched on 16 August 1941. After the war, the ship remained in active service with the RAN and played a small but key role in the British nuclear testing program. She was placed in reserve in 1953. In 1955, Karangi was reactivated and served for another two years until May 1957 and was eventually sold for scrap in 1966.

The Cockatoo Docks & Engineering Company was a ship building and maintenance company which operated the Cockatoo Island Dockyard on Cockatoo Island in Sydney, Australia, between 1933 and 1992.