ICSB

ICSB may refer to:


 * Institute of Chartered Secretaries of Bangladesh
 * International Committee on Systematic Bacteriology, former name of International Committee on Systematics of Prokaryotes, the body that oversees the nomenclature of prokaryotes
 * International Conference on Systems Biology, the primary international conference for systems biology research, meeting annually since 2000
 * International Christian School of Budapest, an international K-12 coeducational school in Diosd, Hungary, founded 1994

School:
 * Immaculate Conception School for Boys, A Catholic Private School located in Malolos, Bulacan, Philippines