KB, kB or kb may stand for:
Businesses and organizations Banks KB Kookmin Bank, South Korea Kaupthing Bank, Iceland Komerční banka, Czech Republic Kasikornbank, Thailand Karafarin Bank, Iran
Libraries National Library of Sweden () National Library of the Netherlands ()
Sport Kalix BF, a Swedish bandy club Kjøbenhavns Boldklub, a sports club, Copenhagen, Denmark
Other businesses and organizations KB Home, a US house builder KB Lager, Australia KB Toys, US K&B, a New Orleans, Louisiana, US drugstore Druk Air (IATA code: KB), Bhutan airline
Entertainment
Kick Buttowski, an American animated series and titular character
People Kevin Bartlett (Australian rules footballer) (born 1947) KB (rapper) (born 1988), Kevin Elijah Burgess KB Killa Beats (born 1983), Zambian record producer Kobe Bryant (1978–2020), American basketball player Kyle Busch (1985–2026), American stock car driver
Places King's Buildings, a University of Edinburgh campus Kota Bharu, a city in Kelantan, Malaysia Kuala Belait, a town in Brunei West Kalimantan (vehicle registration prefix KB)
Science and technology Chemistry Base dissociation constant Kb Ebullioscopic constant Kb, relating molality to boiling point elevation Kauri-butanol value Kb, a measure of solvent performance
Computing Kilobit (kb), 1,000 bits Kilobyte (kB), 1,000 bytes Knowledge base Microsoft Knowledge Base ID prefix
Vehicles KB series, International Harvester trucks Isuzu Faster or KB, a pickup truck Isuzu D-Max or KB, a pickup truck NZR KB class, a New Zealand steam locomotive
Other uses in science and technology Boltzmann constant, k or kB, in physics Kilo-base pair (kb or kbp), length of D/RNA molecule
Other uses Knowledge Bowl, a quiz competition Former Knight Companion of the Order of the Bath WWKB, or KB Radio 1520 A slang name for marijuana