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E4, E.IV or E-4 may refer to:

In entertainment[edit]

In transportation[edit]



In military[edit]

  • Boeing E-4, a U.S. military flying command post
  • Fokker E.IV, a 1915 German fighter aircraft
  • The fourth enlisted rank in the Military of the United States, including
    • Petty Officer Third Class in the United States Navy and United States Coast Guard
    • Senior Airman in the United States Air Force
    • Specialist (rank) in the United States Army (if the soldier is not a non-commissioned officer)
    • Corporal in the United States Army and United States Marine Corps (if the soldier is a non-commissioned officer)

In biology / medicine[edit]


  • E-4 process, an obsolete development process associated with photographic transparency film
  • Honda E4, a predecessor of Honda's ASIMO robot
  • RCS-4, a synthetic cannabinoid sold as "E-4"
  • E4, a postcode district in the E postcode area
  • King's Pawn Game, or 1. e4, a chess opening move
  • E4 or E4, an old name for the exceptional group F4 (mathematics)
  • E4 grade, a grade of difficulty in rock climbing
  • E4 or E4, musical notation indicating the E above Middle C

See also[edit]