| GSIS | General Santos Ilementary School 
| Others |
| GSIS | Georgia Student Information Systems
| Others |
| GSIS | German Swiss International School
| Others |
| GSIS | Global Security Innovative Strategies
| Others |
| GSIS | Global Sustainable Industrial Systems
| Others |
| GSIS | Global System of Integrated Studies
| Others |
| GSIS | Good Shepherd International School
| Others |
| GSIS | Good Shepherd International School,
| Others |
| GSIS | Government Security Insurance System
| Others |
| GSIS | Government Service Insurance Scheme
| Others |
| GSIS | Government Service Insurance System
| Others |
| GSIS | Graduate School of Information Sciences
| Others |
| GSIS | Graduate School of International Studies
| Others |
| GSIS | Graduate Studies Information System
| Others |
| GSIS | Grey Systems and Intelligent Services
| Others |
| GSIS | Gyeonggi Suwon International School
| Others |