KP4
# KP4

KP4, Kp4 or kp4 may refer to

* Killer toxin Kp4 family, a family of killer toxins, which includes the Kp4 killer toxin from the smut fungus Ustilago maydis
* KP4, an amateur radio call sign assigned to operators in Puerto Rico, see Amateur radio licensing in the United States#Call signs
