- Academy Of European Law , located in the German city of Trier
- Earned Run Average (E.R.A.), a baseball statistic
- ECMWF Re-analysis
- Education Reform Act
- ERA Real Estate , also known as Electronic Realty Associates Inc., a world wide franchise of real estate brokers
- Electronic Remittance Advice
- Energy Resources Of Australia , a mining company owned by the Rio Tinto Group
- Engine Room Artificer
- Engineering Research Associates , a pioneering computer firm from the 1950s
- English Racing Automobiles , a manufacturer of racing cars
- Equal Rights Amendment , a proposed, but unratified, USA constitutional amendment
- Era (musical Project) , a music project founded by Eric Levi
- Era (operator) , the brand name of Poland's largest mobile phone network operator, PTC
- Études Et Recherches Acoustiques , a French audiophile manufacturer from the 1970s
- European Railway Agency
- European Robotic Arm , a robot arm for use on the International Space Station
- Explosive Reactive Armour , a type of vehicle armor
- European Research Area
- European Regions Airline Association , an association for aviation businesses.
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