OOI
| Acronym | Definition |
|---|---|
| OOI | Out of Ideas |
| OOI | Onset of Immunity (vaccines) |
| OOI | Ocean Observatories Initiative |
| OOI | Out of Interest |
| OOI | Other Operating Income (financial statements) |
| OOI | Object Oriented Interface |
| OOI | Object-Oriented Inspection |
| OOI | Oilfield Operations Inc. |
| OOI | Office of Organizational Improvement |
| OOI | Osnabrück Openearedness Index |