CA5, CA-5, Ca.5, or Ca5 may refer to: California's 5th congressional district USS Huntington (CA-5), a United States Navy Pennsylvania-class armored cruiser United States Court of Appeals for the Fifth Circuit California State Route 5 (disambiguation) Caproni Ca.5, an Italian heavy bomber of the World War I and post-war era Ca5 line, a regional Catalonia railway line CA-5, a highway in Honduras