HMAS Doomba was a Royal Australian Navy (RAN) warship of World War II.

The vessel was renamed SS Doomba, converted into a passenger ship, and operated in the waters around Brisbane until 1939, when she was requisitioned by the RAN for wartime service.

She was constructed by William Simons & Co at their shipyard in Renfrew, Scotland, launched in 1919, and commissioned later that year.

After being converted to a passenger ship and renamed Doomba, she entered mercantile service in 1923, and was used to carry tourists between Brisbane and Bribie Island.

Her service during World War II earned the ship a battle honour: "Pacific 1941–43".