| Acronym | Definition |
|---|
| OCSO➣Orange County Sheriff's Office (Florida) |
| OCSO➣Ontario County Sheriff's Office |
| OCSO➣Ordo Cisterciensium Strictioris Observantiae (Latin: Order of Cistercians of the Strict Observance; Catholic religious order) |
| OCSO➣Order of Cistercians of the Strict Observance, Trappists and Trappistines (religious order) |
| OCSO➣Off-Campus Student Organization (The College of New Jersey; Ewing, NJ) |
| OCSO➣Onondaga Civic Symphony Orchestra (Baldwinsville, NY) |