FIS
- Albanian clans
- FI (disambiguation)
- FIS (company)
- Fairy Investigation Society
- Festival Internacional de Santander
- Fiji Intelligence Services
- Fis
- Fis phenomenon
- Fish Information and Services
- Flandreau Indian School
- Flight information service
- Foreign Intelligence Service (Russia)
- Frame Information Structure
- Frankfurt International School
- French International School of Hong Kong
- Fukuoka International School
- F♯ (musical note)
- International Ski and Snowboard Federation
- Islamic Salvation Front
- Italian Fencing Federation
- Italian Scout Federation
- Julio Fis
- Ljubomir Pavićević Fis