CA4
# CA4

CA4 may refer to:

* Carbonic anhydrase 4, an enzyme that in humans is encoded by the CA4 gene
* Cornu Ammonis region 4, a region of the hippocampus
* United States Court of Appeals for the Fourth Circuit

CA-4 may refer to:

* CAC CA-4, a 1941 Australian bomber aircraft
* USS Pittsburgh (CA-4), a 1901 United States Navy armored cruiser
* California's 4th congressional district
* California State Route 4
* Central America-4 Border Control Agreement, a boundary treaty between Guatemala, El Salvador, Honduras, and Nicaragua
* Combretastatin A-4, a natural polyphenol

Ca4 may refer to:

$Ca_4$ may refer to:

Ca.4 may refer to:

