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E³ (Electronic Entertainment Expo), a yearly computer and video game expo and conference

Domodedovo Airlines (IATA code "E3")

HMS E3, an E-class submarine of the British Royal Navy that was torpedoed and sunk by the German U-27 on October 18, 1914

EMD E3, a diesel locomotive

E3 Prijs Vlaanderen, a semi classic professional cycling race held in Belgium in March

London E3, the postal code for Bow in London

E-3 Sentry, an AWACS aircraft based on the Boeing 707

E-3, the paygrade of the rank Private First Class in the United States Army

E-3 process, an obsolete development process associated with photographic transparency film

E-3 visa, a non-immigrant visa allowing Australian citizens to live and work in the United States

A model of Mazda E engine

A part of the international E-road network from Cherbourg to La Rochelle in France

Honda E3, one of the predecessors of Honda's ASIMO robot

The name of one of the communications channels defined in the so-called E-carrier standard, the European version of the PDH communications standard. It is the European equivalent of the American DS3

The E3, United Kingdom, Germany and France, the three most populous nations in the EU