BEI

BEI 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.

Bei may refer to:

• 北 (pinyin běi), a Chinese character meaning north, like in Beijing
• Bei River, the northern tributary of the Pearl River in southern China
• In mathematics, Bei is one of the Kelvin functions