OECS
| 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) |