K3

K3 may refer to:

Transportation

• China Railway K3/4
• K-3 (Kansas highway), a state highway in Kansas
• London Bus route K3
• Taquan Air, an Alaskan commuter airline (by IATA code)
• K-3 cart
• Kia Forte, a compact car sold as Kia K3 in South Korea
• Kia K3 (BL7), a subcompact car
• LNER Class K3, a class of British steam locomotives
• GSWRI Class K3, a Great Southern and Western Railway (Ireland) steam locomotive

Military

Weapons

• K-3 (rifle), an Armenian-made bullpup rifle
• Daewoo K3, a light machine gun

Ships

• Soviet submarine K-3 Leninsky Komsomol, the first Soviet nuclear submarine
• , a 1914 United States Navy K-class submarine
• , a 1916 British K-class submarine
• , a 1940 Royal Navy Flower-class corvette

Other

• Pohang Airport, by United States Air Force designator during the Korean War
• Life Regiment Hussars, Swedish cavalry regiment
• K3, a bombproof WWII submarine pen at the German Lorient Submarine Base in France

Science, technology, computing and mathematics

• The Kleene logic K₃
• The complete graph on three vertices
• A version of the K (programming language)
• K3 surface, a compact complex surface in mathematics
• Menadione, vitamin K₃
• K3, 1774 marine chronometer made by Larcum Kendall
• Pentax K-3, a digital SLR camera

Media and entertainment

• K3 (band), a Belgian/Dutch girl group
• K3 (television), a Catalan television channel
• ', a 2009 pornographic horror film
• K3 Film Festival, a film festival held annually in Villach, Austria, since 2007
• K3, a world in