Terasca, or Terrier-ASROC-Cajun, was an American three-stage sounding rocket developed and launched by the United States Navy.

Derived from a combination of the Terrier, ASROC and Cajun rockets, three launches were attempted during 1959, but only one was successful.

The Terrier-ASROC-Cajun ("Terasca") rocket was developed during early 1959 by the Naval Ordnance Test Station, located at China Lake, California, to fill a U.S. Navy requirement for a three-stage sounding rocket, intended to launch experimental payloads for conducting high-altitude research.

[3] The theoretical apogee for Terasca was 98 miles (158 km); it could carry a scientific payload of up to 25 pounds (11 kg).

[3][6] A second launch attempt on June 26, however, was successful, with the rocket reaching an apogee of 60 miles (97 km).