OUSA

OUSA may mean:


 * The Ontario Undergraduate Student Alliance
 * The Open University Students Association, the students' union of the Open University
 * The Organization of African Trade Union Unity (Organisation de l'Unité Syndicale Africaine)
 * Orienteering USA, the national sports governing body for orienteering in the United States
 * OrigamiUSA The largest Origami society in the USA
 * The Otago University Students' Association