K1, K.I, K01, K 1 or K-1 can mean:

Geography

* K1, another name for Masherbrum, a mountain in the Karakoram range in Pakistan * K1, a small town to north of Kirkuk city, Iraq * K1 (building), a high-rise building in Kraków, Poland

Mathematics

K_1(R)

denotes the first Algebraic K-theory#K1, algebraic K-theory group of a ring

R

Military

* Brandt Mle CM60A1, Denel K1, a South African mortar * Daewoo Precision Industries K1, a carbine of the South Korean army * EMER K-1, a Burmese assault rifle designated EMERK * Fokker K.I, a World War I German experimental aircraft * Kucher Model K1, a Hungarian submachine gun * , a World War I British submarine * HMS Acanthus (K01), HMS ''Acanthus'' (K01) / HNoMS Andenes (K01), HNoMS ''Andenes'' (K01), a 1939 British, then Norwegian Flower-class corvette * K1 88-Tank, a modern main battle tank of the South Korean military * K-1 cart a United States Signal Corps cart for carrying signal equipment * K 1, a designation for a List of Swedish cavalry regiments, Swedish cavalry regiment * K1-class gunboat, planned World War II German gunboat * K-class sloop, K1, a World War II Dutch sloop operated by the German Navy * Skoda K-1, of the Skoda K series, a World War II Czechoslovak howitzer * USS K-1 (SS-32), USS ''K-1'' (SS-32), a 1913 United States Navy K class of submarine * K-1 Airfield, former name of the Gimhae Air Base * Soviet submarine K-1 * IVL K.1 Kurki, a Finnish trainer aircraft

Names

* An abbreviation of Keiichi Morisato, a character in the manga/anime ''Oh My Goddess!'' * First name of Keiichi Maebara, a List of Higurashi no Naku Koro ni characters#Main characters, character in ''Higurashi When They Cry'' franchise * K1, a nickname given to Kyler Murray (born 1997), American football quarterback

Transportation

Road transport

* BMW K1, a sport bike * K-1 Attack, a Slovak sports car * K-1 (Kansas highway), a state highway in Kansas * London Buses route K1, a Transport for London contracted bus route * Tatra K1, a 1967 Czechoslovakian experimental tramcar

Steam locomotives

* Furness Railway K1, a steam locomotive related to the Furness Railway K2 * GSR Class K1, a Great Southern Railway Irish steam locomotive * LNER Thompson/Peppercorn Class K1, a 1949 British 2-6-0 (mogul) steam locomotive * NCC Class K1, a Northern Counties Committee Irish steam locomotive * PRR K1, a Pennsylvania Railroad locomotive classification * SR K1 class, a British 2-6-0 steam locomotive * the first 1909 Tasmanian Government Railways K class Garratt, a type of articulated steam locomotive

Water transport

* ''K1 Britannia'', the replica of His Majesty's Yacht ''Britannia'' built in 1893 for Commodore Albert Edward, Prince of Wales * The class/racing number on K1 Britannia, HMY ''Britannia'''s main sail * K1, a canoe racing event under the International Canoe Federation

Other vehicles

* K-1 (rocket), an aerospace vehicle under development by Rocketplane Kistler

Electronics

* Kawai K1, a digital synthesizer * Magnetophon K1, the first tape recorder, produced in Germany in 1935 * Motorola KRZR K1, a mobile phone * Sendo K1, a model of Sendo#Models, Sendo mobile phone * Pentax K-1, a digital single-lens reflex camera * Pentax K-01, a digital mirrorless interchangeable lens camera * Tegra K1, an Nvidia system on a chip for mobile devices

United States government forms

* K-1 visa, a United States immigration visa (also called the fiancé(e) visa) * Schedule K-1, a tax form of the United States Internal Revenue Service (IRS) corresponding with Form 1065 to report one's share of income in a flow-through entity

Music

K. 1 can designate: * six works by Wolfgang Amadeus Mozart: **K. 1a, an Andante in C for Keyboard **K. 1b, an Allegro in C for Keyboard **K. 1c, an Allegro in F for Keyboard **K. 1d, a Minuet in F for Keyboard **K. 1e, a Minuet in G for Keyboard **K. 1f, a Minuet in C for Keyboard * Kk. 1 or K. 1, a sonata for keyboard by Scarlatti; see List of solo keyboard sonatas by Domenico Scarlatti * Kay One (born 1984), German rapper * Kingz One, a music group created in 2003

Miscellaneous

* Family K1, a set of New Testament manuscripts * K1 or K-1, an abbreviation for kerosene heating fuel * K1, a Larcum Kendall marine chronometer (1769) * K-1, a kickboxing promotion * Haplogroup LT or K1, a Y-chromosome DNA haplogroup * K1, an alternative title for Kommune 1 * k1, a coefficient that encapsulates process-related factors, limiting the minimum feature size in photolithography *K1 fund, a suspected German Ponzi-scheme * an abbreviation for Star Wars: Knights of the Old Republic (video game), KotOR 1 * K₁, a common name for the vitamin phylloquinone {{Letter-Number Combination Disambiguation