FCAS may refer to:
- Familial cold autoinflammatory syndrome, a genetic disease
- Fellow of the Casualty Actuarial Society, a U.S. professional society
- The Foundation to Combat Antisemitism, a philanthropic effort by Robert Kraft
- Frequency Control Ancillary Services for electric power grids
- Future Combat Air System, a sixth-generation fighter jet currently in development by France, Germany, and Spain
- Future Combat Air System (UK), a sixth-generation fighter jet, the BAE Systems Tempest, and related technologies currently under development by the United Kingdom, Italy and Sweden.
- FCA Serbia
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