CA9
# CA9

CA9, CA 9, CA-9 or Ca.9 may refer to:

* California State Route 9, a highway in the US state of California
* California's 9th congressional district
* The U.S. Court of Appeals for the Ninth Circuit
* Carbonic anhydrase 9, an enzyme
* Caproni Ca.9, an airplane model from the early 1910s
