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