OCB

OCB may refer to:

• OCB mode, a mode of operation for cryptographic block ciphers
• Oil circuit breaker, a form of circuit breaker using oil as an insulating medium
• Oklahoma City bombing, a bomb attack on the Alfred P. Murrah Federal Building in downtown Oklahoma City on April 19, 1995
• Old Country Buffet, a chain of restaurants managed by Buffets, Inc.
• Operations Coordinating Board (1953—1961), a committee of the United States Executive
• Óquei Clube de Barcelos, a rink hockey team from Barcelos, Portugal
• Orange Catholic Bible, a fictional book from the Dune universe created by Frank Herbert
• Organizational citizenship behavior, a special type of work behavior
• Ordinary course of business, a term in law covering the usual transactions, customs and practices of a certain business and of a certain firm
• Orient Commercial Joint Stock Bank (OCB), a large bank located in Vietnam

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