STAC

STAC may refer to:

Computers and electronics

 * (Set AC Flag) instruction on x86 CPUs, part of Supervisor Mode Access Prevention
 * Stac Electronics, a former American technology company
 * Lempel–Ziv–Stac, a data compression algorithm developed by Stac Electronics
 * SigmaTel Audio Codec
 * an extended version of the Graphic Adventure Creator software
 * SpatioTemporal Asset Catalog, an open specification to describe geospatial information.

Education

 * Southern Theatre Arts Centre, a training venue in Durrington by Sea, Worthing, West Sussex, England
 * St. Thomas Aquinas College, Sparkill, New York
 * Saint Thomas Aquinas College (Sogod), Southern Leyte, Philippines
 * St Andrew's College, Christchurch, New Zealand

Transportation

 * Service des transports de l'agglomération chambérienne (Stac), a transport service in Chambéry, France; part of Compagnie générale française des transports et entreprises
 * Service de transport adapté de la Capitale, a transport service in Quebec, Canada
 * Special Transit Advisory Commission, a commission that founded the Triangle Transit transport service in North Carolina, United States
 * STAC Swiss Government Flights, see List of airline codes (S)
 * Supersonic Transport Aircraft Committee

Other uses

 * STAC (protein), a protein containing a C1 domain
 * Sepak Takraw Association of Canada, a sport association
 * Sirtuin-activating compound, a class of biochemical compounds
 * Spatial and Temporal Analysis of Crime, see Crime hotspots
 * Stac, the Gaelic word for a sea stack, commonly used in Scotland