FPN may mean:
Faculty of Political Science in Sarajevo (Bosnian: ) Faculty of Political Sciences, University of Belgrade (Serbian: ) Family nurse practitioner in the United States Feldpost number, used for transmission of mail to German military in WWII Feminist Peace Network in the United States Fixed penalty notice, in the UK, a notification of what is usually a minor fine for an alleged criminal offence
Science and technology Federated portal network, a software architecture Ferroportin, a protein Filtered-popping network in computer science Fixed-pattern noise in digital imaging