HMPNGS Buna is a Balikpapan-class heavy landing craft operated by the Papua New Guinea Defence Force (PNGDF). Prior to 1974, the vessel was called HMAS Buna and was operated by the Royal Australian Navy (RAN).

The Balikpapan class is a ship class of eight heavy landing craft. All eight were originally laid down by Walkers Limited for the Australian Army in the early 1970s. A reorganisation of watercraft responsibilities in the Australian military meant the landing craft were to be operated by the Royal Australian Navy (RAN), with seven commissioned directly into RAN service during 1973 and 1974, and lead ship Balikpapan transferred from the army to the navy. During the leadup to the independence of Papua New Guinea in 1975, two of the vessels were transferred to the new Papua New Guinea Defence Force (PNGDF).