AP1
# AP1

AP1 or AP-1 may refer to:

## Biology

* Activator protein 1, dimeric transcription factor
* Adaptor protein 1, tetrameric clathrin-associated complex

## Transportation

* Autopista AP-1, a Spanish motorway
* Caproni A.P.1, a 1934 Italian attack aircraft monoplane
* USS Henderson (AP-1)

## Other uses

* Protocol I, or AP 1, a 1977 amendment to the Geneva Conventions
