MV Duntroon was a passenger motor ship built for the Melbourne Steamship Company, that saw military service as a troopship between 1942 and 1949.

At the start of World War II, Duntroon was requisitioned for conversion into an armed merchant cruiser, but was returned as unsuitable.

Swan, Hunter & Wigham Richardson built the ship at Wallsend in 1935 for the Melbourne Steamship Company of Australia.

[4] Duntroon operated as a passenger transport until the start of World War II, when she was requisitioned for conversion into an armed merchant cruiser on 12 October 1939.

[3][7] At 20:37, while attempting to exit Port Phillip Bay, Duntroon collided with the blacked-out auxiliary minesweeper HMAS Goorangai, which was sailing to Portsea to anchor for the night.

[3] During late December 1941 and early January 1942, Duntroon was used to relocate captured officers from the German auxiliary cruiser Kormoran from Fremantle to Murchison, Victoria.

Phoenix, with Duntroon, Katoomba, and Holbrook, departed Melbourne on 12 February as convoy MS.5 bound for Colombo, Ceylon by way of Fremantle.

There, USS Langley and Sea Witch joined with a cargo of aircraft for Java, and the convoy departed Fremantle on 22 February.

The destroyer was sailing from Milne Bay to Buna when she was rammed portside amidships and cut in two by Duntroon just before 02:00 on 29 November, 2 nautical miles (3.7 km; 2.3 mi) from Ipoteto Island (S9.6301, E150.0219).

[19] While in RAN service, Duntroon was used to transport personnel of the British Commonwealth Occupation Force between Japan and Australia until late 1948.

[19][20] Duntroon was returned to her owners in 1946, and resumed coastal passenger and cruising services in January, 1947, sailing from Sydney to Fremantle via Melbourne and Adelaide.