K1, K.I, K01, K 1 or K-1 can refer to:
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k1 in Wiktionary, the free dictionary.
- 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
- 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
- HMS K1, a World War I British submarine
- HMS Acanthus (K01) / HNoMS Andenes (K01), a 1939 British, then Norwegian Flower-class corvette
- K1 tank, or Type 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 Swedish cavalry regiment
- K1-class gunboat, planned World War II German gunboat
- 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), 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
Water transport and sport
- 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 HMY Britannia's main sail
- K1, (single kayak) a canoe racing event under the International Canoe Federation
Other vehicles
- K-1 (rocket), an aerospace vehicle under development by Rocketplane Kistler
- 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
- 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 KotOR 1
- K1, a common name for the vitamin phylloquinone