K4 or K-4 may refer to:
Military Daewoo K4, a South Korean automatic grenade launcher HMS K4, a 1915 British K class submarine K 4 or Norrland Dragoon Regiment, a Swedish Army cavalry regiment K-4 (SLBM), an Indian submarine-launched ballistic missile USS K-4 (SS-35), a 1914 United States Navy K-class submarine
Transport China Railway K3/4 K-4 (Kansas highway), a highway in Kansas Kalitta Air, IATA code K4, an American cargo airline LNER Class K4, a British class of 2-6-0 steam locomotives London Buses route K4, a Transport for London contracted bus route PRR K4s or Pennsylvania Railroad Type K4, a class of American 4-6-2 steam locomotives Kia K4 (2025), a compact car successor to a Kia Forte Kia K4 (China), a Chinese compact car by Dongfeng Yueda Kia
Other uses
K4, a four-man sprint kayak K4, a model of the British red telephone box K4, a normal modal logic K, in graph theory, the complete graph of four vertices K, in abstract algebra, the Klein four-group K4 (mountain) or Gasherbrum II, a mountain between China and Pakistan Kawai K4, a digital synthesizer Koalisyon ng Katapatan at Karanasan sa Kinabukasan (K4, Coalition of Truth and Experience for Tomorrow), a Philippine political coalition K4, an inscription on the sculpture Kryptos
See also
KKKK (disambiguation)