FID
- Elizabeth Field (Suffolk County, New York)
- F.I.D. (album)
- FIDE
- Financial institutions duty
- Flame ionization detector
- Flight initiation distance
- Foreign internal defense
- Free induction decay
- Fréchet inception distance
- International Federation for Information and Documentation
- Lists of country codes
- Projectional radiography
- Stop the Decline
- The Fid