Fass

Fass (barrel, vat) may refer to:
 * Fass 57 (SIG 510), a battle rifle
 * FASS 90 (SIG 550), an assault rifle

Fass or Faß is the surname of:
 * John Fass, American graphic designer
 * Baddon Fass, a fictional character in Dark Empire and Dark Empire II
 * Bob Fass (1933–2021), American radio personality
 * Frederick Fass (1853–1930), American baseball player
 * George Fass and Gertrude Fass, see 77 Sunset Strip
 * Myron Fass, 1970s magazine entrepreneur
 * Patricia Fass Palmer, producer of The Powers That Be

FASS may also refer to:
 * FASS curve, a curve in mathematical analysis which is space-filling, self-avoiding, simple and self-similar
 * FASS (drug formulary), Farmaceutiska Specialiteter i Sverige, the Swedish national formulary of drugs
 * Friends of Assam and Seven Sisters, an international non-profit NGO - see Assamese Associations
 * FASS, a University of Waterloo theater group