CSAS may refer to:

  • Canadian Special Air Service Company, a 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