IFN of IfN may mean

• Interferon, a type of signaling proteins
• Integrated Flux Nebula, a cloud of gas and dust illuminated by the integrated flux of all the stars in the Milky Way (rather than a single star or group of stars).
• Leibniz Institute for Neurobiology (Leibniz-Institut für Neurobiologie), Germany
• India Fund, Inc., a mutual fund
• Isfahan International Airport (IATA code)
• Institutet för Näringslivsforskning, Research Institute for Industrial Economics, Sweden
• Instituto di Fotonica e Nanotecnologie, Institute for Photonics and Nanotechnologies, Trento, Italy

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