GSEC
| Acronym | Definition |
|---|---|
| GSEC | GIAC Security Essentials Certification (computer security certification designation) |
| GSEC | Goldman Sachs Execution & Clearing |
| GSEC | Geophysical Survey and Exploration Contract |
| GSEC | General Secretariat of the Executive Council (United Arab Emirates) |
| GSEC | Guelph Students for Environmental Change (University of Guelph; Guelph, Ontario, Canada) |
| GSEC | Generalized Switch-And-Examine Combining |
| GSEC | Ground State Electron Configuration (chemistry) |