| 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) |