| Acronym | Definition |
|---|
| OECS➣Organization of Eastern Caribbean States |
| OECS➣Optics of Excitons in Confined Systems (physics) |
| OECS➣Oppenheim-Ephratah Central School (Oppenheim, NY) |
| OECS➣Orbital Express Capture System |
| OECS➣Old Episcopal Church of Scotland |
| OECS➣Oxford Early Christian Studies (theology textbooks) |