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Organización de Estados Ibero-Americanos para la Educatión la Ciencìa y la Cultura - OEI
(The Ibero-American States Organization for Education, Science and Culture)
Regroups 22 Spanish and Portuguese speaking Members States + Porto Rico (Ass. U.S.A.)
Head Office: Madrid
Website: www.oei.es
Legal Systems: 21 of Civil law; 1 of Civil law/Common law; 1 of Civil law/Customary law
Alphabetical Index of Members and corresponding legal systems
| Argentina | Civil law |
| Bolivia | Civil law |
| Brazil | Civil law |
| Colombia | Civil law |
| Costa Rica | Civil law |
| Cuba | Civil law |
| Chile | Civil law |
| Dominican Republic | Civil law |
| Ecuador | Civil law |
| El Salvador | Civil law |
| Equatorial Guinea | Civil law / Customary law |
| Guatemala | Civil law |
| Honduras | Civil law |
| Mexico | Civil law |
| Nicaragua | Civil law |
| Panama | Civil law |
| Paraguay | Civil law |
| Peru | Civil law |
| Porto Rico (ASS. USA.) | Civil law/ Common law |
| Portugal | Civil law |
| Spain | Civil law |
| Uruguay | Civil law |
| Venezuela | Civil law |