K-51 or K51 may refer to:
- K-51 (Kansas highway)
- HMS Rockrose (K51), a corvette of the Royal Navy
- Junkers K 51, a German aircraft design study
- La finta semplice, by Wolfgang Amadeus Mozart
- Potassium-51, an isotope of potassium
- Russian submarine Verkhoturye (K-51)
- Soviet submarine K-51
- Toyota K51 transmission
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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