CSAR may refer to:
Alternate spelling of the title of nobility, Tsar
Caris Spatial Archive, a file format for storing bathymetry data
Center for the Simulation of Advanced Rockets
Central South African Railways
Combat search and rescue
Cosa succederà alla ragazza, a music album by Lucio Battisti
Comité secret d'action révolutionnaire, a French anti-communist group better known as La Cagoule...