Found 5 full forms for GPTO
| Term | Full Form | Category |
|---|---|---|
| GPTO | General Postal Treaty Organisation 
| Others |
| GPTO | German Patent and Trademark Office
| Others |
| GPTO | Glenwood Parent Teacher Organization
| Others |
| GPTO | Grand Prix Travel Office
| Others |
| GPTO | Groton Parent Teacher Organization
| Others |