1 E3 may refer to:

• 1000 (number), the natural number following 999 and preceding 1001
• The chess opening move 1.e3, Van 't Kruijs Opening

• Vienna Generating Station
• Vienna (Georgia)
• Vienna Ghetto
• Vienna Giant Ferris Wheel
• Vienna Giant Wheel
• Vienna Hauptbahnhof
• Vienna Hausberge
• Vienna Highflier
• Vienna History Wiki
• Vienna Hofburg
• Vienna Hotel
• Vienna Hotel Group
• Vienna Hotel Group Limited
• Vienna Hotels
• Vienna (Illinois)
• Vienna (Indiana)
• Vienna International Apartment
• Vienna International Hotel
• Vienna Internet Exchange
• Vienna Islamic Centre
• Vienna Japanese School
• Vienna Jazz Festival
• Vienna Junction, Michigan
• Vienna Junction, Monroe County, Michigan
• Vienna Junction, Montmorency County, Michigan