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






  • Boeing E-4, a U.S. military flying command post
  • Fokker E.IV, a 1915 German fighter aircraft
  • E4, 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 (Sergeant until 1976)
    • 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)

Science and technology[edit]

  • E4-isoprostane, a type of isoprostane
  • Leukotriene E4, a naturally produced eicosanoid lipid mediator
  • 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 or E4, an old name for the exceptional group F4

Other uses[edit]

See also[edit]