| Abbreviation | Definition |
|---|---|
| ONA | Ohio Nurses Association |
| ONA | Oklahoma Nurses Association |
| ONA | Ontario Nurses Association |
| ONAI | Oncology Nurses Association of India |
| ONC | Occupational Nurse Consultant |
| ONC | Oncology Nurse Certified |
| ONC | Orthopaedic Nurse Certified |
| ONC | Orthopedic Nurse Certification |
| ONCC | Oncology Nursing Certification Corporation |
| ONCG | Oral Nursing Care Guideline |
| ONL | Organization of Nurse Leaders |
| ONLC | Oregon Nurse Leadership Collaborative |
| ONP | Oklahoma Nurse Practitioners |
| ONP | Overseas Nursing Programme |
| ONQ | Order of Nurses of Quebec |
| ONR | Office for Nursing Research |
| ONR | Office of Nursing Research |
| ONS | Office of Nursing Services |
| ONSA | Oklahoma Nursing Student Association |
| ONSS | Office of Nursing Student Success |