GCB

GCB may refer to:


 * Gaming control board
 * GCB (TV series), American television series
 * GCB (McDonald's), a Malaysian product of McDonald's
 * GCB Bank, formerly Ghana Commercial Bank
 * Generator circuit breaker
 * Gilmore City–Bradgate Community School District
 * Giro Commercial Bank, a defunct commercial bank in Kenya
 * Global Corruption Barometer
 * Gloucestershire Cricket Board, in England
 * Glucocerebrosidase, enzyme
 * (Dame or Knight) Grand Cross of the Order of the Bath
 * Great Calcite Belt, a large region of the ocean with high concentrations of calcite
 * Green Camel Bell, Chinese environmental organization
 * Groupe Communiste Burkinabè, defunct political party of Burkina Faso
 * Guides Catholiques de Belgique, French-speaking Belgian Girl Guiding organization