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EKF may refer to:

  • EKF Elektronik GmbH
  • EKF Diagnostics
  • Electronic Karate Fighters (often shortened to Karate Fighters) a toy by Milton Bradley Company and official sponsor of WWF pay-per-views Survivor Series in November 1996 and D-Generation X: In Your House in December 1997
  • European Karate Federation
  • European Kendo Federation
  • Europe-Korea Foundation
  • Extended Kalman filter