HMAS Acute (P 81) was an Attack-class patrol boat operated by the Royal Australian Navy (RAN).

[1][2] Propulsion machinery consisted of two 16-cylinder Paxman YJCM diesel engines, which supplied 3,460 shaft horsepower (2,580 kW) to the two propellers.

[1][2] The ships were designed with as many commercial components as possible: the Attacks were to operate in remote regions of Australia and New Guinea, and a town's hardware store would be more accessible than home base in a mechanical emergency.

[4][5] Acute was predominantly used for training of Royal Australian Navy Reserve personnel at Fremantle, Western Australia.

Acute was attached to the Permanent Naval Force, and was assigned to the newly completed base at HMAS Stirling.