9 Operational Group was a major Royal Australian Air Force (RAAF) formation providing fighter, ground-attack and anti-shipping support to the Allies in the South West Pacific theatre during World War II.

Established in September 1942, it acted as a mobile striking force independent of the RAAF's static area commands.

9 OG) was formed in New Guinea in September 1942, consisting of seven RAAF squadrons attached to the USAAF's Fifth Air Force.

9 OG assumed responsibility for the formation's administration as well as its operations, making it independent of North-Eastern Area.

[3] In March the group provided the RAAF's contribution to the Battle of the Bismarck Sea, "the decisive aerial engagement" in the SWPA according to General Douglas MacArthur, resulting in twelve Japanese ships being sunk.

Its aircraft carried out operations against enemy bases, shipping and lines of communication along the coast of New Britain.

[3][6] In October–November the group launched a number of major assaults on Rabaul, bombing and strafing ground and naval targets.

[10] It assumed the duties of a garrison force in New Guinea and was renamed Northern Command on 11 April 1944, to better reflect its new function.