IFN (disambiguation)

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