ISB

ISB is an acronym for each of the following:

the Imperial Security Bureau, a fictional Star Wars organization.
Incredible String Band, a British musical group of the late 1960s.
independent sideband, a radio modulation mode used in some AM radio transmissions.
Institute for Systems Biology, a non-profit research institute dedicated to the study and application of systems biology.
In-store bakery, a section of a shop or store which bakes various bread and cake products.
Indian School of Business, a business school in Hyderabad, India.
International School of Brussels, an international school located in Brussels, Belgium.
International School Bangkok, an international school located in Nonthaburi. The school used to be in Bangkok, hence the name. Please note the lack of the word of in the name.
International School of Beijing, an international school located in Beijing, China
International Society of Bassists, an international society dedicated to the double bass.
Invest to Save Budget, UK government scheme launched in 1998-99 "to support projects intended to foster changes in departments' methods of working so as to promote successful innovation and deliver better public services."
Islamabad International Airport, whose IATA code is ISB.
Islamic Society of Baltimore, a tax exempt, non-profit religious organization registered in the state of Maryland.
Islamic Society of Britain, a national voluntary organisation.