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 Education Flandreau Indian School, South Dakota, United States, for Native Americans Frankfurt International School French International School of Hong Kong Fukuoka International School, Japan

Intelligence services Federal Intelligence Service, a Swiss intelligence service Fiji Intelligence Services Foreign Intelligence Service (Russia) ()

Other organizations FIS (company), an American financial services company Fairy Investigation Society, a paranormal society Festival Internacional de Santander, a Spanish music festival Fish Information and Services, an international news agency International Ski and Snowboard Federation (French: ) Islamic Salvation Front (French: ), a defunct political party in Algeria Italian Fencing Federation (Italian: ) and Italian Scout Federation (Italian: )

Surname Julio Fis (born 1974), Spanish/Cuban handball player Marcos Fis (born 2007), Spanish handball player Ljubomir Pavićević Fis (born 1927), Serbian designer

Anthropology Fis is also the Albanian word for the Albanian clans.

See also FI (disambiguation)