Inf or INF may refer to:

  • Infantry, land based soldiers who are specifically trained for the role of fighting on foot
  • Infinity, referring to something without any limit
  • Inflammation, part of the immune response to tissue damage or infection
  • Intermediate-Range Nuclear Forces Treaty, a 1987 arms control treaty between the United States and the Soviet Union
  • International Naturist Federation, the global umbrella organisation representing official national naturist societies
  • Irish National Federation, a nationalist political party in Ireland 1891–1990
  • Infimum, the greatest lower bound of a subset of a partially ordered set
  • Informatics (academic field), the science of information and the practice of information processing
  • INF file, a file extension (information file) used by software and hardware driver installation routines
  • In Guezzam Airport, Algeria
  • Inferior, an anatomical terms of location