K3 may refer to:

Transportation

* China Railway K3/4 * K-3 (Kansas highway), a state highway in Kansas * London Bus route K3 *

Taquan Air Taquan Air is the operating name for Venture Travel, LLC, an American regional airline headquartered in Ketchikan, a city in the southeastern portion of the U.S. state of Alaska. It operates domestic scheduled passenger and charter services. ...

, an Alaskan commuter airline (by IATA code) * K-3 cart *

Kia Forte The Kia Forte (), known as the K3 in Asia, the Forte K3 or Shuma in China and Cerato in South America, Australia, New Zealand and Russia, is a compact car manufactured by South Korean automaker Kia from mid-2008 until 2024, replacing the Kia S ...

, 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 The Great Southern and Western Railway (GS&WR) was an Irish gauge () railway company in Ireland from 1844 until 1924. The grew by building lines and making a series of takeovers, until in the late 19th and early 20th centuries it was the larges ...

(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 In the mathematical field of graph theory, a complete graph is a simple undirected graph in which every pair of distinct vertices is connected by a unique edge. A complete digraph is a directed graph in which every pair of distinct vertices i ...

on three vertices

K_3

* A version of the K (programming language) *

K3 surface In mathematics, a complex analytic K3 surface is a compact connected complex manifold of dimension 2 with а trivial canonical bundle and irregularity of a surface, irregularity zero. An (algebraic) K3 surface over any field (mathematics), field ...

, a compact complex surface in mathematics *

Menadione Menadione is a natural organic compound with the formula C6H4(CO)2C2H(CH3). It is an analog of 1,4-naphthoquinone with a methyl group in the 2-position. It is sometimes called vitamin K3. Use is allowed as a nutritional supplement in animal ...

, vitamin K₃ * K3, 1774 marine chronometer made by Larcum Kendall *

Pentax K-3 The Pentax K-3 is a 24-megapixel Pentax high-end digital single-lens reflex camera with an APS-C sensor, announced on 7 October 2013. The Pentax K-3 is the successor to both the K-5 II and K-5 IIs models, which have a 16-megapixel sensor. The K- ...

, a digital SLR camera

Media and entertainment

K3 (band) K3 is a Belgium, Belgian-Netherlands, Dutch girl group with a Dutch language, Dutch-language Pop music, pop repertoire, consisting of Hanne Verbruggen (singer), Hanne Verbruggen, Marthe De Pillecyn (K3), Marthe De Pillecyn, and Julia Boschman. I ...

, a Belgian/Dutch girl group * K3 (television), a Catalan television channel * '' K3: Prison of Hell'', a 2009 pornographic horror film * K3 Film Festival, a film festival held annually in Villach, Austria, since 2007 *K3, a world in Donkey Kong Country 3: Dixie Kong's Double Trouble!

Other uses

* K3 League, a South Korean football league *

Gasherbrum IV Gasherbrum IV (; ), surveyed as K3, is the 17th highest mountain on Earth and the 6th highest in Pakistan, as well as the highest independent mountain under eight thousand meters in Pakistan. One of the peaks in the Gasherbrum massif, its im ...

, a mountain in the

Karakoram The Karakoram () is a mountain range in the Kashmir region spanning the border of Pakistan, China, and India, with the northwestern extremity of the range extending to Afghanistan and Tajikistan. Most of the Karakoram mountain range is withi ...

previously surveyed as K3. Sometimes erroneously recorded as

Broad Peak Broad Peak (; ) is one of the eight-thousanders, and is located in the Karakoram range spanning Gilgit-Baltistan, Pakistan and Xinjiang, China. It is the 12th highest mountain in the world with elevation above sea level. The first ascent of t ...

. *

Kankakee, Illinois Kankakee ( ) is a city in and the county seat of Kankakee County, Illinois, United States. Located on the Kankakee River, as of 2020, the city's population was 24,052. Kankakee is a principal city of the Kankakee-Bourbonnais-Bradley, IL MSA, Kan ...

, an expression or abbreviation used to identify Kankakee, IL