United Nations trust territories
The United Nations trust territories were the successors of the remaining League of Nations mandates, and came into being when the League of Nations ceased to exist in 1946. All the trust territories were administered through the United Nations Trusteeship Council and authorized to a single country. The concept is distinct from a territory temporarily and directly governed by the United Nations.
The one League of Nations mandate not succeeded by a trust territory was South West Africa, at South Africa's insistence. South Africa's apartheid regime refused to commit to preparing the territory for independence and majority rule, as required by the trust territory guidelines, among other objections. South-West Africa eventually gained independence in 1990 as Namibia.
All trust territories have either attained self-government or independence. The last was Palau, formerly part of the Trust Territory of the Pacific Islands, which became a member state of the United Nations in December 1994.
Trust territories (and administering powers)
Former German
All these territories previously were League of Nations mandates.| Trust territories | United Nations Trusteeship Power | Prior name | Prior sov. | Comments | Current state |
| British Cameroon | United Kingdom | Kamerun | German colonial empire | Following a plebiscite, Northern Cameroons became part of Nigeria in May 1961 and Southern Cameroons joined Cameroon in October 1961. | Nigeria |
| British Cameroon | United Kingdom | Kamerun | German colonial empire | Following a plebiscite, Northern Cameroons became part of Nigeria in May 1961 and Southern Cameroons joined Cameroon in October 1961. | Republic of Cameroon |
| French Cameroon | France | Kamerun | German colonial empire | Achieved independence as Cameroon in 1960. | Republic of Cameroon |
| Territory of Nauru | Australia, New Zealand, United Kingdom | German New Guinea | German colonial empire | Granted independence from Australia in 1968. | Nauru |
| Territory of New Guinea | Australia | German New Guinea | German colonial empire | In 1975, it was legally unified with the Territory of Papua and granted independence as Papua New Guinea. The western half of the island, formerly Dutch and now part of Indonesia, was never part of either territory. | Papua New Guinea |
| Ruanda-Urundi | Belgium | German East Africa | German colonial empire | Separately gained independence in 1962 as Republic of Rwanda and Kingdom of Burundi. | Republic of Rwanda |
| Ruanda-Urundi | Belgium | German East Africa | German colonial empire | Separately gained independence in 1962 as Republic of Rwanda and Kingdom of Burundi. | Republic of Burundi |
| Tanganyika Territory | United Kingdom | German East Africa | German colonial empire | Granted independence in 1961. Federated with the former British protectorate Zanzibar in 1964 to form Tanzania. | United Republic of Tanzania |
| French Togoland | France | Togoland | German colonial empire | Became independent as Togo in 1960. | Togo |
| British Togoland | United Kingdom | Togoland | German colonial empire | This territory was merged in 1956 with the British colony of the Gold Coast, which was granted independence as Ghana in 1957. | Ghana |
| Western Samoa | New Zealand | German Samoa | German colonial empire | Granted independence in 1962, known since 1997 simply as Samoa. | Independent State of Samoa |
Former Japanese possessions
Former Fascist Italian possessions
Italy was the only country to keep its former possession upon becoming a trust Territory.| Trust territories | United Nations Trusteeship Power | Prior name | Prior sov. | Current state | Comments |
| Territory of Somaliland | Italy | Italian East Africa | Italian Empire | Somalia | In 1960, the Trust Territory merged with the State of Somaliland to form the Somali Republic |
Proposed trust territories
- Jerusalem: Under the United Nations Partition Plan for Palestine, Jerusalem would have become a corpus separatum territory under United Nations Trusteeship Council administration. Both Palestinian Arabs and the Yishuv opposed this solution.
- Korea: In wartime talks, Franklin D. Roosevelt proposed that Korea be placed under an American–Soviet trust administration. The plan was eclipsed after Roosevelt's death on 12 April 1945, although it was expressed in the December Moscow Conference, and caused considerable civil unrest in Korea.
- Vietnam: Roosevelt also proposed that French Indochina be placed under an international trusteeship as an alternative to French colonial rule and immediate independence.
- Italian Libya: Between 1945 and 1947, the Soviet Union made various proposals that Tripolitania be placed under Soviet trusteeship for ten years, or a joint trusteeship with the United Kingdom and the United States, or that Libya as a whole become an Italian trusteeship.
- Mandatory Palestine: The United States government under Harry Truman proposed a UN trusteeship status for the Mandatory Palestine in 1948.
- Ryukyu Islands and Bonin Islands: the Treaty of San Francisco included provisions which provided the United States the right to convert its administration over the Ryukyu and Bonin Islands into a trust territory, but it never did so before sovereignty was voluntarily reverted to Japan.