GCAS
GCAS may refer to:
- Gamma Cassiopeiae variable, a type of variable star
- Global Center for Advanced Studies, an educational and research institution located in Dublin, Ireland.
- Global Climate Action Summit, a 2018 climate change conference
- Groundcrewman aircraft support, a branch of the Australian Army Aviation Corps
- Ground Collision Avoidance System, a safety system for aircraft
This disambiguation page lists articles associated with the title GCAS.
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