GCMS may refer to:
- Gas chromatography–mass spectrometry, an analytical method to identify different substances within a test sample
- Gibson City-Melvin-Sibley Community Unit School District 5, a K–12 public school district based in Gibson City, Illinois
- Global Case Management System is a software system used by Immigration, Refugees and Citizenship Canada (IRCC) to process immigration and citizenship applications. Information extracted from this software system is often referred to as GCMS Notes.
This disambiguation page lists articles associated with the title GCMS.
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