HSAS may refer to:
- Hagar Schon Aaronson Shrieve, a rock supergroup from California
- Homeland Security Advisory System, an American color-coded terrorism threat advisory scale
- Hydrocephalus, a congenital disorder colloquially known as 'water on the brain'
- High School of American Studies, a specialized public high school in Bronx, New York
See also
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This disambiguation page lists articles associated with the title HSAS.
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