| OPT | Observation Participation And Teaching 
| Others |
| OPT | Occupational Privilege Tax
| Others |
| OPT | Occupied Palestinian Territories
| Others |
| OPT | Occupied Palestinian Territory
| Others |
| OPT | Ocean Power Technologies
| Others |
| OPT | Oceanside Photo and Telescope
| Others |
| OPT | Ocular Photodynamic Therapy
| Others |
| OPT | Office of Pediatric Therapeutics
| Others |
| OPT | Office of Pupil Transportation
| Others |
| OPT | Official Practice Test
| Others |
| OPT | Ohio Proficiency Test
| Others |
| OPT | Old Profanity Territory
| Others |
| OPT | Olive Peirce Today
| Others |
| OPT | On Pace To ....
| Others |
| OPT | Online Polling Tool
| Others |
| OPT | Online POS Terminal
| Others |
| OPT | Ontological Paradigm Technique
| Others |
| OPT | Open Packet Telephony
| Others |
| OPT | Open Plug in Technology
| Others |
| OPT | Open Positive Transference
| Others |
| OPT | Open Protocol Technology
| Others |
| OPT | Operational Planning Team
| Others |
| OPT | Operational Pressure Transducer
| Others |
| OPT | Operations Project Team
| Others |
| OPT | opisthotonos
| Others |
| OPT | Optic Pathway Tumour
| Others |
| OPT | Optical
| Others |
| OPT | OPTical grade solvent
| Others |
| OPT | Optical Process Test
| Others |
| OPT | Optical Projection Tomography
| Others |
| OPT | Optician
| Others |
| OPT | Optics
| Others |
| OPT | Optimal Purchasing Technique
| Others |
| OPT | Optimization and Profiling Tool
| Others |
| OPT | Optimize Support File
| Others |
| OPT | Optimize support file (QEMM)
| Others |
| OPT | Optimized Production Technology
| Others |
| OPT | Optimum
| Others |
| OPT | Optimum Contact Patch
| Others |
| OPT | Optimum Performance Training
| Others |
| OPT | Option
| Others |
| OPT | Option Pack
| Others |
| OPT | Optional Practical Training
| Others |
| OPT | Options for Transpath
| Others |
| OPT | Oral Provocation Test
| Others |
| OPT | Orange Port Terminal Railway
| Others |
| OPT | Order Print Transfer
| Others |
| OPT | Oregon Professional Technologist
| Others |
| OPT | Organization of Parents and Teachers
| Others |
| OPT | Original Point Therapy
| Others |
| OPT | Orthodox People Together
| Others |
| OPT | Osteoconductive Porous Tricalcium
| Others |
| OPT | Ounces Per Tonne
| Others |
| OPT | Outdoor Payment Terminal
| Others |
| OPT | Outpatient treatment
| Others |
| OPT | Outreach Project Tool
| Others |
| OPT | Ozarks Public Telecommunications
| Others |
| OPT | Ozarks Public Television
| Others |
| OPT | Ozone Processing Team
| Others |