FID

FID or fid may refer to:

• Elizabeth Field (Suffolk County, New York), US, IATA code
• Fid, a hollow spike for use in ropework
• The Fid, a mountain in Antarctica
• F.I.D. (album), by Masami Akita
• FID, the country code used by FIDE
• Financial institutions duty, an Australian tax
• Flame ionization detector
• Flight initiation distance
• Foreign internal defense
• Free induction decay
• Fréchet inception distance, image quality metric
• International Federation for Information and Documentation
• Focus-image distance in projectional radiography
• Stop the Decline (Italian: Fermare il Declino), an Italian political party