Aoba Detachment (Japanese: 青葉支隊) was the reinforced 4th Infantry Regiment/IJA 2nd Division, a part of the Seventeenth Army.
Aoba Detachment was to land at Port Moresby, New Guinea, as soon as the Midway - Aleutians victory was won.
Three days later, orders were issued to recapture both Guadalcanal and Tulagi, in addition to carrying out the Port Moresby Operation.
The advance echelon of the Aoba Detachment, reached Rabaul on 31 August, and was considered for use as reinforcements in the Battle of Milne Bay until Admiral Gunichi Mikawa concluded the situation was hopeless and ordered Milne Bay evacuated.
At the beginning of October the IJA 2nd Division began to arrive at Guadalcanal and absorbed the remains of the Aoba Detachment.