Global Climate Observing System
- Name: Global Climate Observing System
- Alternative Name: GCOS
- Specification URI: https://gcos.wmo.int/
- Type: governmental organisation
- Disciplines: Climatology
- Keywords: atmospheric data, measurement network
- Description: The Global Climate Observing System (GCOS) regularly assesses the status of global climate observations of the atmosphere, land and ocean and produces guidance for its improvement.