OAN
- El Arrayán Airport
- Guardians of the Universe
- Iranian Embassy siege
- National Astronomical Observatory (Chile)
- Oan Djorkaeff
- One America News Network
- Open Access Network
- Open-access network
- Orthodoxy, Autocracy, and Nationality
- Oxford Archaeology North
- Param, Federated States of Micronesia
- Spanish National Observatory
- Ōan