IOF

IOF may refer to:


 * Fraunhofer IOF, the Fraunhofer Institute for Applied Optics and Precision Engineering
 * Independent Order of Foresters
 * Infraorbital foramen, an opening in the skull under the eye socket
 * Institute of Forestry, a forestry-related technical institute under Tribhuvan University, Nepal's largest academic institution
 * Institute of Frescography, an institute for fresco and mural art
 * Chartered Institute of Fundraising
 * International Orienteering Federation
 * International Osteoporosis Foundation, a global alliance of organizations concerned with osteoporosis and metabolic bone disease
 * Israel Occupation Forces or Israel Offensive Forces, pejorative terms for the Israel Defense Forces in Palestine