K6 or K-6 may refer to:
- 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 Bravo Air Congo
- K 6 (keelboat), sailboat class
- Other uses
- K-6 (education), the grades which are traditionally grouped together in American elementary schools; formerly Kindergarten through sixth grade
- K6 HMG, a 12.7mm heavy machine gun of South Korea
- 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
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