CA3
# CA3

CA3 may refer to:

* Carbonic anhydrase III, muscle specific, a human gene
* Cornu Ammonis region 3, one of the hippocampal subfields
* United States Court of Appeals for the Third Circuit

CA-3 may refer to:

* Buhl-Verville CA-3 Airster
* Buhl CA-3 Airsedan
* CAC CA-3 Wirraway
* California's 3rd congressional district
* California State Route 3

Ca.3 may refer to :

