FNI
FNI stands for:
- Technical standards committee for information processing (1962–1987)
- Fridtjof Nansen Institute
- Feline Neonatal Isoerythrolysis
- Nimes-Alès-Camargue-Cevennes airport in France (IATA code)
- Fédération Naturiste Internationale , also International Naturist Federation
- Front for Nationalism and Integration , a militia in the DR Congo
- Frankfurt Niederrad train station (DS100 code)