English abbreviations from ocase to ocd
- OCASE (Ontario Computer Animation & Special Effects Tax Credit)
- OCASP (Orange County Active Single Parents)
- OCAST (Oklahoma Center for the Advancement of Science and Technology)
- OCB (Oklahoma Center for the Book)
- OCBC (Orange County Badminton Club)
- OCC (Operations Control Center)
- O.C.C. (Ordo Carmelitarum Calceatorum (Carmelites))
- Occ. (Occupation)
- OCCA (Ocean Cargo Clearance Authority)
- OCCB (Office of Community Capacity Building)
- OCCC (Oahu Community Correctional Center)
- OCCH (Office of the Chief of Chaplains)
- OCCS (Off Campus and Commuter Services)
- OCD (Obsessive-Compulsive Disorder)
- O.C.D. (Ordo Carmelitarum Discalceatorum (Discalced, or Barefoot, Carmelites))