ERS may refer to:
- The Electoral Reform Society
- Elektroprivreda Republike Srpske
- Elevator Repair Service, a New York-based theater ensemble
- Ellipsoidal reflector spotlight
- ERS10, a share index of the Banja Luka Stock Exchange
- European Rail Shuttle, a Dutch rail freight company, or its subsidiary European Rail Shuttle Railways,
- Either of the two European Remote-Sensing Satellites
- Evaluated Receipt Settlement, a form of invoicing
- Egyptian Ratscrew or Egyptian Rat Slap, a card game
- Employees Retirement System of Texas
- Emergency Restoration System
- Energy Restoration System
- European Respiratory Society, the European professional association of lung physicians
- Èrs, an ancient people in South-Eastern Georgia, North-West Azerbaijan and, before that, Northern Armenia
- Electronic Reporting System to record, report, process, store and send fisheries data (catch, landing, sales and transhipment)
- Erma Road Subdistrict
- Economic Research Service
- Elizabethan Religious Settlement
- Elk River Station