The West New Guinea dispute (1950–1962), also known as the West Irian dispute, was a diplomatic and political conflict between the Netherlands and Indonesia over the territory of Dutch New Guinea. While the Netherlands had ceded sovereignty over most of the Dutch East Indies to Indonesia on 27 December 1949 following an independence struggle, it retained control over its colony on the western half of New Guinea. The Indonesian government claimed this territory as well, on the basis that it had belonged to the Dutch East Indies and that the new Republic of Indonesia was the legitimate successor to the former Dutch colony.
During the first phase of the dispute (1950–1954), Indonesia pursued bilateral negotiations with the Netherlands.