Jackknife may refer to:

  • Pocketknife or jackknife, a compact, foldable knife
  • Jackknife Bar, Portland, Oregon, U.S.
  • Jackknifing, a type of crash with articulated vehicle combinations

Film and television

  • Jacknife, a 1989 American film by David Jones
  • "Jack Knife", an episode of NCIS
  • Jackknife, a character on Superjail!

Athletics and sports

  • Jackknife (exercise), an abdominal exercise
  • Jackknife, a kicking move involving 540-degree rotation
  • Jackknife, a type of high dive
  • Jackknife hold, a pinning move in professional wrestling

Other uses

  • Jackknife (statistics), a resampling technique in statistics
  • Jackknife clam, common name for several species of bivalve mollusc

See also

  • Jackknife Bascule Bridge, a bridge in Thunder Bay, Ontario, Canada
  • The Jack-Knife Man, a 1920 film