The Organisation of Eastern Caribbean States (OECS) is an International Inter-governmental Organisation dedicated to economic harmonisation and integration, protection of human and legal rights, and the encouragement of good governance among independent and non-independent countries in the Eastern Caribbean.

The OECS is now an eleven member grouping comprising the full Member States of Antigua and Barbuda, Commonwealth of Dominica, Grenada, Montserrat, St Kitts and Nevis, Saint Lucia and St Vincent and the Grenadines, with the British Virgin Islands, Anguilla, Martinique and Guadeloupe as associate members of the OECS.