RIF or Rif may refer to: Arts and entertainment Renju International Federation, Renju is the professional variant of the board game Gomoku R.I.F., a 2011 film Computing Requirements Interchange Format, XML file format that can be used to exchange requirements Routing information field, a source route-related field in the token ring network frame header Rule Interchange Format, a W3C recommendation-track effort Russian Internet Forum Military Reconnaissance in force, a type of military operation used specifically to probe an enemy's disposition The Royal Irish Fusiliers (Princess Victoria's), an infantry regiment of the British Army, raised in 1881 Realistic Imitation Firearm, a replica that realistically portrays a firearm; see Legal issues in airsoft R-39 Rif, Soviet and Russian submarine-launched ballistic missile People Isaac Alfasi (1013–1103), Rabbi Isaac ben Jacob Alfasi (1013—1103), was a Talmudist and posek Riff languages, a grouping of languages spoken in the Rif area Riffian people, inhabitants of the Rif Region Places Rif (sandbank), in the Netherlands Rif, a mountain chain and a region in Morocco The Republic of the Rif, a short-lived republic in the region which fought against Spanish rule. Rif, Iceland, in the municipality of Snæfellsbær Rif Airport Science Retrieval-induced forgetting, a phenomenon in memory Rif (GTPase), small signalling G protein Rifampicin, the antibiotic Right iliac fossa, part of the surface of the human abdomen The initials on bars of soap purported to have been made of human fat in World War II Other uses Reading Is Fundamental, an organization promoting children's literacy Reduction in Force, a large-scale ending of employment Riff, a brief relaxed musical phrase repeated over changing melodies See also Riff (disambiguation) Reef (disambiguation)