| OAN | Objective Assessment of Need 
| Others |
| OAN | Objectively Assessed Need
| Others |
| OAN | OCEANIE / AFRIQUE NOIRE FINE ART BOOKS
| Others |
| OAN | Oceanie/Afrique Noire
| Others |
| OAN | Ohio Afterschool Network
| Others |
| OAN | Ohio Articulated Number
| Others |
| OAN | Ohio Articulation Number
| Others |
| OAN | Okta Application Network
| Others |
| OAN | Olfactory Anterior Nucleus
| Others |
| OAN | On Another Note
| Others |
| OAN | One America News
| Others |
| OAN | Online Account Number
| Others |
| OAN | Online Advertising Network
| Others |
| OAN | Only Anorexics Needed
| Others |
| OAN | Ontario Access Number
| Others |
| OAN | Ontario AIDS Network
| Others |
| OAN | Open Access Network
| Others |
| OAN | Open Air Networks
| Others |
| OAN | Open All Night
| Others |
| OAN | Open Application Network
| Others |
| OAN | Open Architecture Network
| Others |
| OAN | Open Austrian Network
| Others |
| OAN | Operational Advice Notices
| Others |
| OAN | Optical Access Network
| Others |
| OAN | Optimal Adding Node
| Others |
| OAN | Oregon Association of Nurseries
| Others |
| OAN | Organization for the Advancement of Nigerians
| Others |
| OAN | Orthopedic Associates of Naperville
| Others |
| OAN | OSAP Access Number
| Others |
| OAN | Owner Acknowledgement Number
| Others |
| OAN | Owner Applied Number
| Others |
| OAN | Owner Applied Numbers
| Others |