IPN may refer to:
Payments Instant payment notification
Chemistry Interpenetrating polymer network, form of chemical copolymer Isopropyl nitrate, a liquid monopropellant
Industry IPN, a type of I-beam used on European standards
Outer space Interplanetary Internet InterPlaNet InterPlanetary Network, a group of spacecraft equipped with gamma-ray burst detectors
Medicine and anatomy Infectious pancreatic necrosis, disease in fish Interpeduncular nucleus, a region of the brain
Other Index of Place Names in Great Britain World Bank's Inspection Panel of the World Bank Group Instytut Pamięci Narodowej (Institute of National Remembrance), a Polish historical research institute Instituto Pedro Nunes, technology transfer center of the University of Coimbra Instituto Politécnico Nacional (National Polytechnic Institute), Mexican university International Policy Network (1971–2011), former British think tank International Polio Network, former name of Post-Polio Health International IPN, IATA code for Usiminas Airport in Minas Gerais, Brazil International pitch notation, a method to specify musical pitch