K6 or K-6 may refer to:

• K6 (mountain), a mountain in Pakistan
• K6 pipe, a geological formation in Northern Alberta, Canada
• K6, shorthand for ul. Konwiktorska 6, address of the Stadion Miejski im. gen. Kazimierza Sosnkowskiego

• HMS K6, a British submarine
• USS K-6 (SS-37), a 1914 United States Navy K-class submarine
• Ka 6, a glider manufactured by Alexander Schleicher GmbH & Co, Germany
• K6, IATA code for Cambodia Angkor Air
• K 6 (keelboat), sailboat class
• K-6 (1926–1927 Kansas highway), now part of K-9
• K-6 (1927–1958 Kansas highway), now part of US 59
• K-6 (1968–1981 Kansas highway), now K-5
• New Hampshire Avenue–Maryland Line, a Washington Metropolitan Area Transit Authority bus line in suburban Washington, D.C.

• K-6 (education), the grades which are traditionally grouped together in American elementary schools; formerly Kindergarten through sixth grade
• K6 machine gun [ko], a 12.7 mm heavy machine gun of South Korea based on M2 Browning
• K-6 (missile), an Indian ballistic missile
• K6 Telephone Kiosk, a type of red telephone box in use the United Kingdom since 1935
• AMD K6, a computer microprocessor
• Sonata in C for Keyboard and Violin, sixth work by Wolfgang Amadeus Mozart according to the Köchel catalogue
• Grushin K-6, a Soviet Air to air missile developed in the 1950s
• Kimber K6S, a revolver

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