CSAS

CSAS may refer to:


 * Canadian Special Air Service Company, an elite post-war parachute unit.
 * Center for the Study of the American South
 * Central Sleep Apnea Syndrome
 * Combined Statistical Area, a statistical unit used by the United States Census and other offices.
 * Coal Smoke Abatement Society, a predecessor to Environmental Protection UK.
 * Community Safety Accreditation Scheme
 * Chattanooga School for the Arts & Sciences
 * Czechoslovak Academy of Sciences
 * Command Stability Augmentation System, a fly-by-wire feature of the Panavia Tornado.