CA1

CA1, CA-1, CA 1, or Ca.1 may refer to:

Aircraft and other vehicles

• Buhl CA-1 Airster, an American sports airplane
• Caproni Ca.1 (1910), an experimental biplane of 1910
• Caproni Ca.1 (1914), a World War I bomber
• Schneider CA1, the first French tank

Biology

• CA1 (gene), a human gene
• CA1, a subfield or region of the hippocampus proper

Law

• United States Court of Appeals for the First Circuit

Places and roads

• the road designation for the Central American Highway 1 (CA-1), the portion of the Pan-American Highway passing through the Central American countries
• California State Route 1

Politics

• California's 1st congressional district