BEI

BEI or B.E.I. may refer to :


 * Binary ethylenimine, an inactivant used in the inactivation of the foot-and-mouth disease virus
 * Business Entity Identifier, an ISO 9362 Bank Identifier Code (BIC) assigned to a non-financial entity
 * Balanced Ecology, Inc.
 * Bureau des enquêtes indépendantes), Quebec's police watchdog
 * Indonesia Stock Exchange or Bursa Efek Indonesia