| Abbreviation | Definition |
|---|---|
| OI | Outings and Innings |
| OIC | Optical Imaging Centre |
| OID | Office of Instructional Development |
| OIE | Office of Institutional Effectiveness |
| OIE | Office of International Education |
| OIEA | Office of Institutional Effectiveness and Assessment |
| OIEU | Ocean Institute of Eastern University |
| OII | Oxford Internet Institute |
| OIK | Organisation für Internationale Kontakte / Organization for International Contacts |
| OIO | Onderzoeker In Opleiding (PhD student; Research worker in training) |
| OIO&T | Ohio Institute of Photography and Technology |
| OIP | Office of International Programs |
| OIPE | Office of Institutional Planning and Effectiveness (Western Carolina University) |
| OIR | Office of Institutional Research |
| OIR | Office of Instructional Resources |
| OIS | Office for Information Systems |
| OIS | Office of Instructional Services |
| OIS | Oslo International School |
| OISE | Ontario Institute for Studies in Education (University of Toronto) |
| OISS | Office for International Students and Scholars |