HSAS

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