CGSB is an abbreviation which may refer to a number of different things:
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Chatham Grammar School for Boys
Holcombe Grammar School (formerly Chatham Grammar School for Boys) is a grammar school with academy status in Chatham, Kent, England. It is a selective school. From the 2017-18 academic year, the school planned to become co-educational and remai ...
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Simón Bolívar Guerrilla Coordinating Board
The Simón Bolívar Guerrilla Coordinating Board ( es, Coordinadora Guerrillera Simón Bolívar or CGSB) was an umbrella group of guerrilla organizations in Colombia from 1987 to the early 1990s. The Revolutionary Armed Forces of Colombia, the 1 ...
*Canadian General Standards Board
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