| Abbreviation | Definition |
|---|---|
| NWTP | North West Transnationals Project |
| NWTRB | Nuclear Waste Technical Review Board |
| NYI | Not Yet Implemented |
| NYPTI | New York Prosecutors Training Institute, Inc. |
| NYSSAI | New York State Sheriffs Association, Inc. |
| NYSSAI | New York State Sheriffs’ Association, Inc. |
| NYW | Western District of New York of the United States Attorney's Office |
| NZG | Near Zero Growth |
| O | Overt |
| O/S | Operations and Support life cycle phase |
| OA | Office of Administration |
| OAA | Office of Academic Affiliations |
| OAC | Office of Antiboycott Compliance |
| OAE | Office of Attorney Ethics |
| OAG | Office of the Attorney General |
| OAH | Office of Administrative Hearings |
| OAI | OAI: Office Action Indicated |
| OAI | Open Archives Initiative |
| OAIT | Office of American Indian Trust |
| OALJ | Office of Administrative Law Judges |