- King's Bench, an ancient English court, or the legal citation denoting a case in such court.
- Knight Bachelor, an English Order of Chivalry (a Knighthood).
- Kjøbenhavns Boldklub, a Danish sports club based in Copenhagen
- King's Buildings, one of the primary campuses at the University of Edinburgh, containing most of the schools within the College of Science and Engineering
- Druk Air (IATA code: KB), the national airline of Bhutan
- Kine Bud, a fairly potent strain of marijuana often referred to as KB, and, erroneously, Kind Bud
- Knowledge base, a collection of knowledge helping users with a given product
- Knowledge Bowl, an interdisciplinary academic competition
- Knight of the Bath, a former rank (before 1847) of the Order of the Bath, a part of the British honours system
- sometimes also incorrectly used to refer to Knight Bachelor, which should be abbreviated "Kt".
- KB Lager, a brand of Australian beer
- WWKB, a radio station often referred to as KB Radio 1520.
- Abbreviation for "Knowledge Base"
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