The 3rd New Guinea Infantry Battalion (3 NGIB) was a battalion of the Australian Army during World War II. One of four infantry battalions raised in New Guinea to fight against the Japanese, 3 NGIB was formed in June 1945, and spent the remainder of the war training. After becoming operational, it was sent to New Britain where it undertook garrison duties around Rabaul in the post war period. It later became part of the Pacific Islands Regiment before being disbanded in November 1947.