KCB is a TLA that may stand for:

• Keep Chicago Beautiful (kcb.org)
• Kekchi Council of Belize
• Kenya Commercial Bank (kcb.co.ke)
• Knight Commander of the Order of the Bath (see British honours system)
• Knottingley Concert Brass
• Koninklijk Conservatorium Brussel (kcb.be)
• Kyoto Convention Bureau

KCB is the SIL code for the Kawacha language of Papua New Guinea.