FIL or Fil may refer to:

• Father-in-law
• Fil Barlow (born 1963), Australian cartoonist
• Fil Bo Riva (born 1993), Italian singer
• Fil Delacruz (born 1950), Filipino artist
• Fil Fraser (1932–2017), Canadian broadcaster, filmmaker, civil servant and educator
• Fil Hearn (born 1938), American architectural and art historian
• Joseph Fil (born 1953), American army general
• Svitlana Fil (born 1969), Soviet rower
• Zbigniew Fil (born 1977), Polish musician

• Federation of International Lacrosse
• Florida Instructional League, an American baseball league
• Florida International League, a defunct American baseball league
• International Luge Federation

• Al-Fil, the 105th sura of the Qur'an
• Fidelity International Limited, an American investment management company
• FIL file (disambiguation)
• Filipino language
• Filmjölk, a Swedish fermented milk product
  • Viili, a variant
• Firestone Indy Lights, an American developmental automobile racing series
• Functional Imaging Laboratory, at University College London
• Guadalajara International Book Fair, (Spanish: Feria Internacional del Libro de Guadalajara)
• Filecoin, a cryptocurrency

• Fils (disambiguation)
• Fill (disambiguation)