| GC/MS | Gas Chromatography/Mass Spectrometry
| Others |
| GCMS | Gas Chromatograph Mass
| Others |
| GCMS | Gas Chromatograph Mass Spectrometer
| Others |
| GCMS | Gas Chromatographic Mass Spectrometer
| Others |
| GCMS | Gas Chromatography Mass Spectrometry
| Others |
| GCMS | Gas Chromatography Mass Spectroscopy
| Others |
| GCMS | GC/ MS
| Others |
| GCMS | Generic Color Management System
| Others |
| GCMS | Generic Colour Management System
| Others |
| GCMS | Genesee County Medical Society
| Others |
| GCMS | Gibson City-Melvin-Sibley
| Others |
| GCMS | Glacier Creek Middle School
| Others |
| GCMS | Global Card Management System
| Others |
| GCMS | Global Case Management System
| Others |
| GCMS | Global Communications Media Service, Inc.
| Others |
| GCMS | Government Contractor Monitoring Station
| Others |
| GCMS | Graduate Centre for Medieval Studies
| Others |
| GCMS | Gray's Creek Middle School
| Others |
| GCMS | Greene County Medical Society
| Others |
| GCMS | Greene County Middle School
| Others |
| GCMS | Grover Cleveland Middle School
| Others |