'''CRAC''' might refer to:
* The CRAC-II "Calculation of Reactor Accident Consequences" study * A castle, as in Krak des Chevaliers * A Computer Room Air Conditioner * Clube Recreativo e Atlético Catalano, a Brazilian football (soccer) club commonly known as CRAC * Clube Recreativo Atlético Campoverdense, a Brazilian football (soccer) club commonly known as CRAC * Crac, a 1981 Oscar-winning animated short film * Calcium Release Activated Channels, ion channels in cell membrane * Closed Reduction And Cast, an orthopaedic surgical procedure
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