OC
- oc – (s) Occitan language (ISO 639-1 code)
- OC – (i) Officer Commanding
- OCA – (i) Observatoire de la Côte d'Azur – Offensive Counter-Air
- OCD – (i) Obsessive-Compulsive Disorder
- OCFS – (i) Oracle Cluster File System
- OCFS – (i) Office of Children & Family Services
- OCFS2 – (i) Oracle Cluster File System Release 2
- oci – (s) Occitan language (ISO 639-2 code)
- OCIDS – (i) Optical Combat Identification System
- OCMCC – (i) Orchard County MCC
- OCN – (i) Oncology Certified Nurse
- OCO – (i) Oort Cloud Object
- OCOKA – (a) Observation, Cover and concealment, Obstacles, Key terrain, and Avenues of approach (mnemonic)
- OCR – (i) Optical Character Recognition
- OCS – see entry
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