CA-38 or CA38 may refer to:
California's 38th congressional district, an electoral division in the State of California USS San Francisco (CA-38), a United States Navy New Orleans-class heavy cruiser California State Route 38, a highway in the State of California Calcium-38 (Ca-38 or 38Ca), an isotope of calcium Caproni Ca.38, an Italian aircraft Araimachi Station, a railway station in Kosai, Shizuoka Prefecture, Japan (station code: CA38)