The Organization of Ibero-American States (Spanish: Organización de Estados Iberoamericanos, Portuguese: Organização de Estados Ibero-americanos; abbreviated as OEI), formally the Organization of Ibero-American States for Education, Science and Culture, is an international organization made up of 23 members states of Iberophone nations in Europe and the Americas, as well as one member in Africa.

The OEI’s membership is composed of all of the sovereign states of Ibero-America and the Iberian Peninsula, as well as Equatorial Guinea. All members are Portuguese and Spanish speaking nations, in addition to Andorra, which is predominantly Catalan speaking, though the organization does not include all the Iberophone nations of the world.