Civilian Saucer Intelligence

Civilian Saucer Intelligence (CSI) may refer to:


 * Civilian Saucer Investigation of Los Angeles (CSI-LA), Edward J. Sullivan's California-based organisation, active 1952-54;
 * Civilian Saucer Intelligence of New York (CSI-NY), Davis, Bloecher, and Mebane's New York-based org., active 1954-59.