| OTSS | ODC Training Support System 
| Others |
| OTSS | Off The Shelf Software
| Others |
| OTSS | Office of Technical Support Services
| Others |
| OTSS | Office of Technology Support Services
| Others |
| OTSS | Office of Transfer Student Services
| Others |
| OTSS | Omologato Turismo Sprint Speciale
| Others |
| OTSS | On The Safe Side
| Others |
| OTSS | On The Spot Signs
| Others |
| OTSS | On The Spot Studio
| Others |
| OTSS | Online Technical Support Service
| Others |
| OTSS | Online Technical Support System
| Others |
| OTSS | Online Tutorial Signup System
| Others |
| OTSS | Only The Strong Survive
| Others |
| OTSS | Ontario Trust for Student Support
| Others |
| OTSS | Open System Transport and Session Support
| Others |
| OTSS | Operational and Technical Security Services
| Others |
| OTSS | Operational Technical Security Services
| Others |
| OTSS | Operational Telecommunications Switching System
| Others |
| OTSS | Operations Technology and Shared Services
| Others |
| OTSS | Ottawa Technical Secondary School
| Others |
| OTSS | Outside The Square Solutions
| Others |
| OTSS | Outside Top Sponson Sheeting
| Others |
| OTSS | Over the Scope Stent
| Others |
| OTSS | Overseas Technical Support Services
| Others |
| OTSS | Overseas Trade Support for SMEs
| Others |
| OTSS | Oxford Text Searching System
| Others |