FIS or fis may refer to:
Science and technology
- Fis, an E. Coli gene
- Fis phenomenon, a phenomenon in linguistics
- F♯ (musical note)
- Flight information service, an air traffic control service
- Frame Information Structure, a Serial ATA technology
Organizations
- FIS (company), an American financial services company
- Fairy Investigation Society
- Federal Intelligence Service, a Swiss intelligence service
- Festival Internacional de Santander, a Spanish music festival
- Fiji Intelligence Services
- Fish Information and Services, an international news agency
- Flandreau Indian School
- Foreign Intelligence Service (Russia) (Russian: Служба внешней разведки Российской Федерации, romanized: Sluzhba vneshney razvedki Rossiyskoy Federatsii, IPA: [ˈsluʐbə ˈvnʲɛʂnʲɪj rɐˈzvʲɛtkʲɪ])
- Frankfurt International School
- French International School of Hong Kong
- Fukuoka International School
- International Ski and Snowboard Federation (French: Fédération Internationale de Ski et de Snowboard)
- Islamic Salvation Front (French: Front Islamique du Salut), a defunct political party in Algeria
- Italian Fencing Federation (Italian: Federazione Italiana Scherma) and
- Italian Scout Federation (Italian: Federazione Italiana dello Scautismo)
Surname
- Julio Fis (born 1974), Spanish handball player
- Ljubomir Pavićević Fis (born 1927), Serbian designer
Anthropology
- Fis is also the Albanian word for the Albanian clans.