EER may refer to:
- Energy efficiency ratio, or COP, a measure to assess heat pumps and air conditioners
- Energy efficiency rating, a score out of six stars applied to housing in the Australian Capital Territory
- East of England Regiment, a British army unit
- Equine Exertional Rhabdomyolysis, a muscular problem due to carbohydrate overload in horses
- Emerging Energy Research, a subsidiary of IHS Inc.
- Enhanced Entity-Relationship Model, a high-level conceptual data model extended from the Entity-Relationship Model
- European Economic Review, a journal published by Elsevier
- Equal Error Rate, a score to measure the accuracy of a Biometric system.
- Experimental event rate
- Enlisted_Performance_Report