CA37, CA-37, or California 37 may refer to:
California's 37th congressional district, a congressional district in the U.S. state of California California State Route 37, a state highway in the northern part of California , a United States Navy cruiser California 37 (album), the sixth studio album from pop rock band Train Calcium-37 (Ca-37 or 37Ca), an isotope of calcium Caproni Ca.37, an Italian aircraft Bentenjima Station, a railway station in Chūō-ku, Hamamatsu, Japan (station code: CA37)