OUSA
| Acronym | Definition |
|---|---|
| OUSA | Origami USA |
| OUSA | Open University Students Association (Open University, UK) |
| OUSA | Ontario Undergraduate Student Alliance |
| OUSA | Office of Undergraduate Studies and Advising |
| OUSA | Organisation de l'Unité Syndicale Africaine (French: Organization of African Trade Union Unity) |
| OUSA | Oglethorpe University Students Abroad (Oglethorpe University; Atlanta, GA) |
| OUSA | Orienteering USA |