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