| OC/T | Observer Controller/ Trainer 
| Others |
| OCT | Clinical Trials
| Others |
| OCT | Object Code Technology
| Others |
| OCT | Object Code Translator
| Others |
| OCT | Occipito Cervico Thoracic
| Others |
| Oct | Octal
| Others |
| OCT | Octalizer Musical file
| Others |
| OCT | Octane
| Others |
| Oct | October
| Others |
| OCT | Ocular Coherance Tomography
| Others |
| OCT | Ocular Coherence Tomography
| Others |
| OCT | Ocular Coherence Topography
| Others |
| OCT | Odometer Correction Tool
| Others |
| OCT | Office Customization Tool
| Others |
| OCT | Office of Cable Television
| Others |
| OCT | Office of Clinical Trials
| Others |
| OCT | Office of Community Transportation
| Others |
| OCT | Office of Counter Terrorism
| Others |
| OCT | Office of the Chief Technologist
| Others |
| OCT | Officer Cadet Trainee
| Others |
| OCT | Offset Catch Tray
| Others |
| OCT | Okaloosa County Transit
| Others |
| OCT | Oklahoma City Thunder
| Others |
| OCT | Olean Community Theatre
| Others |
| OCT | Olympic Container Terminal
| Others |
| OCT | Omnidirectional Control Technology
| Others |
| OCT | On Campus Transition
| Others |
| OCT | On Chip Termination
| Others |
| OCT | On Company Time
| Others |
| OCT | Online Certification Training
| Others |
| OCT | Ontario Certified Teacher
| Others |
| OCT | Ontario College of Teachers
| Others |
| OCT | Opel Club of Texas
| Others |
| OCT | Opel Combo Tour
| Others |
| OCT | Open Charge Tester
| Others |
| OCT | Open Tubular Column
| Others |
| OCT | Operator Certification Training
| Others |
| OCT | Optical Coherence Thermography
| Others |
| OCT | Optical Coherence Tomography
| Others |
| OCT | Optimal Control Theory
| Others |
| OCT | Optimal Cutting Temperature
| Others |
| OCT | Optimal Cuttting Temperature
| Others |
| OCT | Optimized Cardioid Triangle
| Others |
| OCT | Optimized Compensation Transactions
| Others |
| OCT | Oracle Club in Tomsk
| Others |
| OCT | Oracle Command Type
| Others |
| OCT | Order Confirmation Transaction
| Others |
| OCT | Oregon Children's Theatre
| Others |
| OCT | Oregon Contemporary Theatre
| Others |
| OCT | Organic Cation Transporter
| Others |
| OCT | Organizational Concepts And Technologies
| Others |
| OCT | Orphan Car Tour
| Others |
| OCT | Otago Community Trust
| Others |
| OCT | Ouellet Carter And Tumaroff
| Others |
| OCT | Output Control Transistor
| Others |
| OCT | Outsourcing in Clinical Trials
| Others |
| OCT | Overseas Chinese Town
| Others |
| OCT | Overseas countries and territories
| Others |
| OCT | Oxford Classical Texts
| Others |
| OCT | Oxytocin Challenge Test
| Others |