E4

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

Entertainment

• E4 (TV channel), a digital television channel in the United Kingdom and Ireland
• Every Extend Extra Extreme a video game from Q Entertainment
• Entertainment for All, a video game expo

Transportation

• Aero Asia International, an airline, by IATA code

Roads

• European route E4, a road through Finland and Sweden
• E4 European long distance path, a European long-distance trail

Trains

• E4 Series Shinkansen, a Japanese high-speed train
• CNW Class E-4, a 4-6-4 steam locomotive of the Chicago & Northwestern Railway
• EMC E4, a diesel locomotive
• LB&SCR E4 class, a steam locomotive of the London, Brighton & South Coast Railway
• LNER E4 Class, a 2-4-0 steam locomotive built by the Great Eastern Railway and operated by the LNER
• PRR E4, an American PRR 4-4-2 steam locomotive

Military

• 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

• 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

• E4, a postcode district in the E postcode area
• King's Pawn Game, or 1. e4, a chess opening move
• E4 grade, a grade of difficulty in rock climbing
• E4 or E₄, musical notation indicating the E above Middle C

See also

• EIV (disambiguation)