The 1st New Guinea Infantry Battalion (1 NGIB) was a battalion of the Australian Army during World War II. One of four infantry battalions raised in New Guinea, 1 NGIB was formed in March 1944. In late 1944, the battalion began deploying company-sized elements in support of combat operations on Bougainville, New Britain and on mainland New Guinea. It later became part of the Pacific Islands Regiment before being disbanded in June 1946.