GCOS
| Acronym | Definition |
|---|---|
| GCOS | Global Climate Observing System |
| GCOS | General Comprehensive Operating System |
| GCOS | GeneChip Operating Software (Affymetrix) |
| GCOS | General Comprehensive Operating System (Honeywell) |
| GCOS | God's Chosen Operating System |
| GCOS | Ground Computer Operating System (US NASA) |
| GCOS | Geologic Chance of Success (oil drilling) |
| GCOS | Great Canadian Oil Sands Limited (est. 1953; Alberta, Canada) |
| GCOS | General Chief of Staff |
| GCOS | Global Cyberspace Operations Synchronization (security) |