English abbreviations from oc to ocas
- oc (Occitan language (ISO 639-1 code))
- O.C. (Ordo C(h)aritatis (Fathers of the Order of Charity))
- OC's (Optical centres)
- OC/T (Observer Controller/ Trainer)
- OCA (Ocean Reef Club Airport (FAA: 07FA))
- OCAD (Ontario College of Art and Design)
- OCAD U (OCAD University (prior to 2010, OCAD was an acronym for Ontario Collage of Art & Design))
- O. Camald. (Ordo Camaldulensium (Camaldolese))
- OCAP (OpenCable Application Platform)
- OCAR (Office of the Chief of Army Reserve)
- O. Cart. (Ordo Cartusiensis (Carthusians))
- OCAS (Ontario College Application Service)