| Acronym | Definition |
|---|
| ONA➣Ontario (Amtrak station code; Ontario, CA) |
| ONA➣Online News Association (Washington, DC) |
| ONA➣Overseas News Agency (UK) |
| ONA➣Open Network Architecture |
| ONA➣One Number Access |
| ONA➣Online Network Access |
| ONA➣Open-Network Architecture |
| ONA➣Ontario Nurses Association |
| ONA➣Open and Affirming |
| ONA➣Office of National Assessments (Australia) |
| ONA➣Ohio Nurses Association |
| ONA➣Oregon Nurses Association |
| ONA➣Overseas National Airways (1950-1978) |
| ONA➣Other Needs Assistance (US FEMA program) |
| ONA➣Oklahoma Nurses Association |
| ONA➣Open Network Access (mobile communications) |
| ONA➣Operational Net Assessment |
| ONA➣Office of Net Assessment |
| ONA➣Order of the Nine Angles (Satanism) |
| ONA➣Outreach to New Americans (National Crime Prevention Council, Bureau of Justice Assistance and the Office of Refugee Resettlement) |
| ONA➣Organizational Needs Assessment (Canada) |
| ONA➣Optimum Natural Arrangements (landscape contract business; Sequim, WA) |
| ONA➣Original Net Anime |
| ONA➣On-Line Archive |
| ONA➣Ocicats of North America (various locations) |
| ONA➣Orienteering North America (magazine) |
| ONA➣Outreach North America (Associate Reformed Presbyterian Church) |
| ONA➣Of New Astronomy (apparel company) |
| ONA➣Optical Network Architecture |
| ONA➣OSI Network Address |
| ONA➣Omnium North Africa |
| ONA➣Optimal Nutritional Allowance |
| ONA➣Office of Negotiations and Agreements (Foreign Agricultural Service, United States Department of Agriculture) |
| ONA➣Onsite Network Administrator |
| ONA➣Onondaga Numismatic Association |
| ONA➣Office of Network Administration |