UEI can refer to
- Unidad Especial de Intervención (Special Intervention Unit, UEI), the emergency response unit of the Spanish Guardia Civil.
- United Electronic Industries, a U.S. based data acquisition hardware manufacturer.
- Unified Emulator Interface (Eclipse).
- UEI College, a career education school located in California.
- Uppermost Electronic Industries Co., Ltd. mfg of Thermistors & Varistors in Taiwan.
- Universal Electronics Inc, usually referred to as UEI, mfg of remote and sensing products
