K3

K3, K03 or K-3 may refer to:
* K3 (band), a Belgian girl group
* K-3 (Kansas highway), a state highway in Kansas
* K3 League, a Korean football league
* K3 (programming language), the third version of the k programming language created by Arthur Whitney
* K3 surface, a compact complex surface in mathematics
* K3 (television), a Catalan television channel
* Daewoo K3, a light machine gun
* GSWRI Class K3, a Great Southern and Western Railway Irish steam locomotive
* HMS K3, a 1916 British K class submarine
* HMS Heliotrope (K03), a 1940 British Navy Flower class corvette
* London Buses route K3, a Transport for London contracted bus route
* Soviet submarine K-3 "Leninsky Komsomol", the first Soviet nuclear submarine
* USS K-3 (SS-34), a 1914 United States Navy K-class submarine
* YP-K3, a brand of MP3 player by Samsung

and also :
* K3, the 5th world in the Super Nintendo game Donkey Kong Country 3
* Broad Peak, a mountain previously called K3
* K-3, an Armenian-made assault rifle
* Taquan Air (IATA airline designator for the Alaskan commuter airline)
* a Larcum Kendall maritime chronometer