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E3, E.III, E03, E-3 or E³ can refer to:

In sports and games

• E3 Prijs Vlaanderen (English: E3 Prize Flanders), a professional cycling race held in Belgium
• E3, one of the European long-distance paths

In military

• E-3 Sentry, an AWACS aircraft based on the Boeing 707
• Fokker E.III, a 1915 Dutch fighter aircraft
• HMS E3, an E-class submarine of the British Royal Navy
• Pfalz E.III, a German aircraft
• Siemens-Schuckert E.III, a German aircraft
• E-3 (rank), a paygrade in the United States Military

In organizations

• Electronic Entertainment Expo, a yearly video game expo and conference
• E3, Germany, United Kingdom and France, the three nations with the largest populations and economies within the European Union
• E3 Media (digital agency), a creative digital agency based in the United Kingdom
• Economics for Equity and the Environment Network (E3), a nonprofit organization based in Portland, Oreg]]

In places

• London E3, the postal code for Bow in London

In science and technology

• E3 Ubiquitin ligase, a protein component of proteasome-mediated protein degradation
• E-3 process, an obsolete development process associated with photographic transparency film
• e3 (text editor), a text editor
• Honda E3, a 1991 Honda E series ASIMO predecessor robot
• Olympus E-3, a digital SLR camera
• E3, a clade of the human Y-chromosome DNA haplogroup E
• E3, a communications channel defined in the E-carrier standard
• E³.series, electrical CAD software
• Dihydrolipoamide dehydrogenase, the third element of the pyruvate dehydrogenase complex
• E3 binding protein, a metabolic protein

In transportation

• E3 National Highway, a National Highways of Pakistan
• E3 Series Shinkansen, a Japanese high-speed train
• EMC E3, a diesel locomotive
• European route E03, a European route
• LB&SCR E3 Class, a 1894 British class of steam locomotives
• London Buses route E3, a bus route in London
• Mazda E engine#E3

Other

• E-3 visa, a non-immigrant visa allowing Australian citizens to live and work in the United States
• E03 : Other hypothyroidism ICD-10 code

The Electronic Entertainment Expo (Exposition) or E3 is one of the biggest conferences for video games in the world. Every year in May, game developers and other professional people gather to show off new video games, computer hardware, and features. It is only open to people who have been invited and people visiting must be over eighteen years old.

Other websites

• Official E3 website