The UN General Assembly voted 114-17 on Friday to recognize the Transitional National Council as the official representative of Libya in the international organization, DPA reported.
The 193-nation assembly voted overwhelmingly to allow the council's envoys to take over the UN seat of the Moamer Gaddafi regime and to participate in the debates of the 66th session.
There were also 15 countries that abstained, including Saudi Arabia.
The 17 countries that opposed the TNC inclusion included African countries like South Africa, Angola, Kenya, Lesotho, the Democratic Republic of Congo, Zambia and Zimbabwe and Latin American countries like Nicaragua, Venezuela and Bolivia.
Nicaragua said it objected because the Libyan revolution against the Gaddafi regime was backed by NATO and it was "not a real revolution."
"Revolution cannot be but authentic, not made by proxy or can never be seized by a cupola of states with clear hegemonic interests," said the Nicaraguan envoy Maria de Chamorro.
The assembly in April suspended Libya's membership in the UN Human Rights Council in Geneva in protest against Gaddafi's alleged killing of civilian protesters.
The UN Security Council was also preparing a resolution, which when adopted would deploy a mission to support the TNC for an initial period of three months. The mission's tasks would include post-conflict reconstruction and the restoration of institutions, drafting a new constitution and organizing elections.