K3

• 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

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

• Soviet submarine K-3 Leninsky Komsomol, the first Soviet nuclear submarine
• {{USS|K-3|SS-34}}, a 1914 United States Navy K-class submarine
• {{HMS|K3}}, a 1916 British K-class submarine
• {{HMS|Heliotrope|K03}}, a 1940 Royal Navy Flower-class corvette

• 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

• The Kleene logic K₃
• 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

• K3 (band), a Belgian/Dutch girl group
• K3 (television), a Catalan television channel
• K3: Prison of Hell, a 2009 pornographic horror film
• K3, a world in Donkey Kong Country 3: Dixie Kong's Double Trouble!

• K3 League, a South Korean football league
• Gasherbrum IV, a mountain in the Karakoram previously surveyed as K3. Sometimes erroneously recorded as Broad Peak.
• Kankakee, Illinois, an expression or abbreviation used to identify Kankakee, IL

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• {{intitle|K3}}
• {{intitle|k-3}}
• KKK (disambiguation)
• 3K (disambiguation)

{{Letter-Number Combination Disambiguation}}