| Acronym | Definition |
|---|
| OTA | Office of Technology Assessment |
| OTA | Occupational Therapy Assistant |
| OTA | Over-The-Air |
| OTA | Optical Tube Assembly (telescopes) |
| OTA | Offer to Adopt |
| OTA | Old Timers Association (various organizations) |
| OTA | Organic Trade Association |
| OTA | Organized Team Activities (football) |
| OTA | Orthopaedic Trauma Association |
| OTA | Office of Technical Assistance |
| OTA | Open to All |
| OTA | Orascom Telecom Algerie (est; 1998; various locations) |
| OTA | Open Test Architecture |
| OTA | Old Town Alexandria (Alexandria, VA) |
| OTA | Organized Team Activity |
| OTA | Overall Track |
| OTA | over the Air |
| OTA | Optical Transmit Asymmetry |
| OTA | Office of the Telecommunications Adjudicator |
| OTA | Oracle Training Administration |
| OTA | Oxford Text Archive (UK) |
| OTA | Operational Transconductance Amplifier |
| OTA | Over-The-Air Management |
| OTA | One Touch Access (Nokia) |
| OTA | One Time Authentication |
| OTA | OpenTravel Alliance |
| OTA | Online Travel Agent |
| OTA | Offseason Training Activities (US Football) |
| OTA | Optical Trapping Applications |
| OTA | Optical Telescope Assembly |
| OTA | Office of Tax Analysis |
| OTA | Oklahoma Turnpike Authority (Oklahoma City, OK) |
| OTA | Orthodontic Technicians Association (UK) |
| OTA | Online Trust Alliance (Bellevue, WA) |
| OTA | Operational Test Agency |
| OTA | Office of Tribal Affairs (Agency for Toxic Substances and Disease Registry) |
| OTA | Office of Technology Assistance (US Congress) |
| OTA | Out of the Air (pricing methodology) |
| OTA | Office of the Administrator |
| OTA | Original Total Annihilation |
| OTA | Ontario Tennis Association |
| OTA | Officer's Training Academy (India) |
| OTA | Orchard Training Area |
| OTA | Ordered to Appear (legal courts) |
| OTA | Oceanside Tourism Association (Canada) |
| OTA | On-Time Arrival |
| OTA | Oklahoma Technology Administrators |
| OTA | Ontario Telecommunications Association |
| OTA | Open to Air (wound dressing) |
| OTA | Older Than Average (student) |
| OTA | Operational Transconductor Amplifier |
| OTA | Operational Test Authority |
| OTA | Oracle Transport Agent |
| OTA | Ocean Systems Technician Analyst |
| OTA | Office of Territorial Affairs |
| OTA | Oil Technology Association |
| OTA | Oregon Telephone Association |
| OTA | Obligatory Thug Attack (gaming) |
| OTA | Oracle Training Administrator/Administration |
| OTA | Other Transactional Authority |
| OTA | Officer Training Allowance |
| OTA | Other Transactional Agreement |
| OTA | Ordnance Transmission Assembly |
| OTA | Optical Transition Amplitude |
| OTA | Order to Acceptance (project management) |