IPN

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

 * Independent Practitioners Network association for practitioners in psychotherapy, counselling, and related fields
 * 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