The Royal Pacific Islands Regiment (RPIR) is an infantry regiment of the Papua New Guinea Defence Force (PNGDF). The regiment is descended from the Australian Army infantry battalions formed from native soldiers and Australian officers and non-commissioned officers in the territories of Papua and New Guinea during World War II to help fight against the Japanese. Disbanded after the war, the regiment was re-raised in 1951 as part of the Australian Army and continued to serve until Papua New Guinea gained its independence in 1975, when it became part of the PNGDF. Today, the RPIR consists of two battalions and has seen active service in Vanuatu, Bougainville and the Solomon Islands.

The Papua New Guinea Defence Force (PNGDF) is the military organisation responsible for the defence of Papua New Guinea. It originated from the Australian Army land forces of the territory of Papua New Guinea before independence, coming into being in January 1973 and having its antecedents in the Pacific Islands Regiment. The PNGDF is a small force, numbering around 3,600 personnel, and consists of a Land Element, an Air Element and a Maritime Element. It is a joint force tasked with defending Papua New Guinea and its territories against external attack, as well as having secondary functions including national-building and internal security tasks.