| Abbreviation | Definition |
|---|---|
| NFLA | National Football League Alumni |
| NNAA | Nepal Norway Alumni Association |
| NUAA | National University Alumni Association |
| NUAA | Nipissing University Alumni Association |
| NVAA | Norland Viking Alumni Association |
| NZAC | New Zealand Alumni Convention |
| OAA | Offender Alumni Association |
| OAACA | Office for Alumni Affairs and Career Advancement |
| OAAD | Office of Alumni Affairs Development |
| OACS | Office of Alumni and Career Services |
| ODAR | Office of Development and Alumni Relations |
| OFAN | Oneonta Future Alumni Network |
| OOAA | Oregon Ophthalmologic Alumni Association |
| OOAA | Oregon Ophthalmological Alumni Association |
| OOAC | OFW OSCAR Alumni Club |
| ORAA | Oxy Rugby Alumni Association |
| OUAA | Oakland University Alumni Association |
| OUAA | Oklahoma University Alumni Association |
| OUAA | Osmania University Alumni Association |
| OVAL | Outreach Volunteer Alumni Link |