List of parties to the United Nations Convention on the Law of the Sea

The United Nations Convention on the Law of the Sea (UNCLOS) is the international agreement that resulted from the third United Nations Conference on the Law of the Sea (UNCLOS III), which took place between 1973 and 1982. The convention was opened for signature on 10 December 1982 and entered into force on 16 November 1994 upon deposition of the 60th instrument of ratification.

The convention has been ratified by 168 parties, which includes 167 states (164 United Nations member states plus the UN Observer state Palestine, as well as the Cook Islands and Niue) and the European Union. An additional 14 UN member states have signed, but not ratified the convention.

Subsequently, the "Agreement relating to the implementation of Part XI of the United Nations Convention on the Law of the Sea" was signed in 1994, amending the original Convention. The agreement has been ratified by 150 parties (all of which are parties to the Convention), which includes 148 states (145 United Nations member states plus the UN Observer state Palestine, as well as the Cook Islands and Niue) and the European Union. An additional three UN member states have signed, but not ratified the agreement.

States with a dagger () are landlocked states.

An additional 14 UN member states have signed the Convention but have not ratified it. One UN member state has signed the Agreement but has not ratified it.

There are 15 United Nations member and observer states which have neither signed nor acceded either the Convention or the Agreement:

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