CA1
# 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
