| 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 |