RIF may refer to:

• Realistic Imitation Firearm, A replica, often an airsoft gun that realistically portrays a firearm. import and sale of these is prohibited in the United Kingdom under the VCRA (Violent crimes reduction act) unless an individual is entitled to a specific defence such as being an airsoft skirmisher. See Legal issues in airsoft for more.
• Reconnaissance in force, a type of military operation used specifically to probe an enemy's disposition
• Reading Is Fundamental, an organization promoting children's literacy
• Reduction in Force, a large-scale ending of employment
• Reichsstelle für industrielle Fettversorgung meaning of the initials on bars of soap purported to have been made of human fat
• Renju International Federation, Renju is the professional variant of board game Gomoku
• Requirements Interchange Format
• Resistance is futile, a catchphrase in Star Trek
• Retrieval-induced forgetting, a phenomenon in memory
• Rifampicin, the antibiotic, abbreviated
• Right iliac fossa, part of the surface of the human abdomen
• Routing information field, a source routing-related field in the token ring network frame header
• The Royal Irish Fusiliers (Princess Victoria's), an infantry regiment of the British Army, raised in 1881
• Rule Interchange Format, a W3C recommendation-track effort
• Russian Internet Forum
• Radical Islamic Fundamentalist

The Rif or Riff (Tamazight ⴰⵔⵔⵉⴼ Arrif) is a mainly mountainous region of northern Morocco, with some fertile plains, stretching from Cape Spartel and Tangier in the west to Ras Kebdana and the Melwiyya River in the east, and from the Mediterranean in the north to the river of Wergha in the south.

/rif is a pop-rock band formed in Bandung, Indonesia in 1995. The group comprises vocalist Andy, guitarist Jikun, drummer Maggi, guitarist Ovy and bassist Teddy.