EID

EID, an acronym, may refer to:


 * Ecological interface design, a framework for designing complex sociotechnical, real-time, and dynamic systems
 * Electronic identification, digital systems used for proof of identity
 * eUICC identifier, a 32-digit unique identifier of an eUICC eSIM device, representing the identity of a mobile device to a cellular network service provider
 * eSIM Identifier, a misnomer for eUICC Identifier
 * Emerging infectious disease, an increasingly prevalent infectious disease
 * Emotional instability disorder, a psychological condition formerly known as borderline personality disorder