CASR

CASR may stand for:
 * State highways in California, the highways in the US state of California
 * Centre for Automotive Safety Research, the road safety research centre based in the University of Adelaide
 * Calcium-sensing receptor
 * Civil Aviation Safety Regulation, which is set forth by the Civil Aviation Safety Authority, an Australian federal agency responsible for the regulation of private and commercial flight.
 * Anarchic Cell For Revolutionary Solidarity, an anarchist urban guerilla group in Bolivia