The Territory of New Guinea was an Australian administered territory from 1920 until 1975. In 1949, the Territory and the Territory of Papua were established in an administrative union by the name of the Territory of Papua and New Guinea. That administrative union was renamed as Papua New Guinea in 1971. Notwithstanding that it was part of an administrative union, the Territory of New Guinea at all times retained a distinct legal status and identity until the advent of the Independent State of Papua New Guinea.
Queen Elizabeth II was Queen of the United Kingdom and the Dominions of the British Commonwealth from 6 February 1952, which also made her Queen of the Territory of New Guinea.
The Papua and New Guinea Act 1949 united the Territory of Papua and the Territory of New Guinea as the Territory of Papua and New Guinea.
Upon independence of Papua New Guinea, she became Queen of Papua New Guinea.