HMAS Sea Mist

HMAS Sea Mist (Q10) was a channel patrol boat operated by the Naval Auxiliary Patrol of the Royal Australian Navy (RAN) during World War II.

Sea Mist was a 65 ft cruiser built by Lars Halvorsen and Sons in 1939 for motor racing identity Hope Bartlett. She was requisitioned and later commissioned by the RAN as a channel patrol boat.

During the attack on Sydney Harbour by the Imperial Japanese Navy on 31 May 1942, the Sea Mist, together with Steady Hour and Yarroma, spotted the conning tower of midget submarine M-21 in Taylors Bay. The patrol boats had set their depth charge fuses to 15 m, and when Sea Mist passed over the place where the submarine had just submerged and dropped a depth charge, she had only five seconds to clear the area. The blast damaged M-21, which inverted and rose to the surface before sinking again. Sea Mist then dropped a second depth charge, which damaged one of her two propellers and prevented her from making further attacks.

Sea Mist earned one battle honours for her wartime service, "Pacific 1942".