| Acronym | Definition |
|---|
| OTS➣Officer Training School |
| OTS➣Office of Thrift Supervision (US Department of the Treasury) |
| OTS➣Office of Technology Services |
| OTS➣On the Square (various organizations) |
| OTS➣Outer Space Treaty (est. 1967; space law; various nations) |
| OTS➣Office of Traffic Safety |
| OTS➣Options Trading System |
| OTS➣On the Side (band) |
| OTS➣Organization for Tropical Studies (Costa Rica) |
| OTS➣Off-The-Shelf |
| OTS➣Open Testing Service |
| OTS➣On the Spot |
| OTS➣Original Text Service (press communications) |
| OTS➣Out of Service (complete system/equipment failure) |
| OTS➣On the Scene |
| OTS➣One Tight Slap |
| OTS➣Ontario Tire Stewardship (Ontario, Canada) |
| OTS➣Overseas Trade Statistics (UK) |
| OTS➣Over The Shoulder |
| OTS➣Opportunity To See |
| OTS➣Oncotherapy Science, Inc. (Japan) |
| OTS➣Object Based Temporal Scalability |
| OTS➣Open Technical Support |
| OTS➣over Temperature Shutdown |
| OTS➣Open Two Seater |
| OTS➣Optical Transport Section |
| OTS➣Object Transaction Service |
| OTS➣Old Testament Survey |
| OTS➣Office of Transportation Services (various locations) |
| OTS➣Object Transaction Service (CORBA) |
| OTS➣One Time Settlement (legal) |
| OTS➣Ontario Thoracic Society (Ontario, Canada) |
| OTS➣Open Two Seater (Jaguar) |
| OTS➣Optimind Technology Solutions (Philippines) |
| OTS➣Optical Transport System (Ciena) |
| OTS➣Operator Training Simulator |
| OTS➣Occupational Therapy Student |
| OTS➣Ordre du Temple Solaire (French: Order of the Solar Temple) |
| OTS➣One-Time Source (US DoD) |
| OTS➣Octadecyltrichlorosilane |
| OTS➣Officers Training School (Mangla, Pakistan) |
| OTS➣Office of Toxic Substances |
| OTS➣Office of Transport Security (Australia) |
| OTS➣Off the Subject |
| OTS➣Orbital Test Satellite |
| OTS➣Over-The-Side |
| OTS➣Otosclerosis |
| OTS➣Operator Training System |
| OTS➣Order Tracking System |
| OTS➣Offer to Settle (law) |
| OTS➣Oxford Transport Strategy |
| OTS➣Opening Theme Song |
| OTS➣Oil Temperature Sensor (automotive engines) |
| OTS➣Office of Trial Staff |
| OTS➣Open Theme Standard |
| OTS➣Oahu Transit Services, Inc. |
| OTS➣Open Tech Support |
| OTS➣Over The Sofa (artwork) |
| OTS➣Oshkosh Transit System |
| OTS➣Owensboro Transit System (Kentucky, USA) |
| OTS➣Over Target Schedule |
| OTS➣Object Telephony Server |
| OTS➣Off Tool Sample |
| OTS➣Orchestra at Temple Square (Mormon Tabernacle Choir; Salt Lake City, Utah) |
| OTS➣Office Telesystem |
| OTS➣Occurrence Tracking System |
| OTS➣Online Transaction System |
| OTS➣Optical Telemetry System |
| OTS➣Open Transport Service |
| OTS➣Ocean Thermal Structure |
| OTS➣Outer Thermal Shield |
| OTS➣Operational Test Site |
| OTS➣Orbit Transfer System |
| OTS➣Open to Sky (architecture) |
| OTS➣Ordo Templi Satanas (Satanism) |
| OTS➣Operations Testing and Simulations |
| OTS➣Orbital Tracking Station |
| OTS➣Officers' Tactical School |
| OTS➣Omnidirectional Tracking System |
| OTS➣OSI Transparent Services |
| OTS➣Operator Telephone System (ITU-T) |
| OTS➣Ordinary Train Staff |