CA45

CA45, CA-45, or CA 45 may refer to:

• California's 45th congressional district, a congressional district in the U.S. state of California
• California State Route 45, a state highway in California
• USS Wichita (CA-45), a United States Navy cruiser
• Calcium-45 (Ca-45 or ⁴⁵Ca), an isotope of calcium
• Caproni Ca.45, an Italian aircraft