| SPTO | Sationsouth Pacific Tourism Organisation 
| Others |
| SPTO | School PUPIL TRACKER Online
| Others |
| SPTO | Scott Parent Teacher Organization
| Others |
| SPTO | Senior Plant Technician Operator
| Others |
| SPTO | Senior Professional and Technology Officer
| Others |
| SPTO | Sequoia Parent Teacher Organization
| Others |
| SPTO | Shelton Parent Teacher Organization
| Others |
| SPTO | Single Person Train Operation
| Others |
| SPTO | South Pacific Tourism Organisation
| Others |
| SPTO | South Pacific Tourism Organization
| Others |
| SPTO | Southern Participating Transmission Owners
| Others |
| SPTO | Spanish Patent And Trademark Office
| Others |
| SPTO | Spanish Patent Trademark Office
| Others |
| SPTO | Stow Parent Teacher Organization
| Others |
| SPTO | Student Parent Teacher Organization
| Others |
| SPTO | Student Physical Therapy Organization
| Others |
| SPTO | Sunapee Parent Teacher Organization
| Others |
| SPTO | Swimming Pool Technical Operator
| Others |