K56 or K-56 may refer to:
- K-56 (1927–1937 Kansas highway), an historical designation of Kansas state highway K-52
- K-56 (1937–1957 Kansas highway), an historical designation of Kansas state highway K-98
- HMS Asphodel (K56), a British Royal Navy Flower-class corvette
- Potassium-56 (K-56 or 56K), an isotope of potassium
- Soviet submarine K-56, various submarines of the Soviet Navy
See also
edit- Koolhoven F.K.56, a 1930s Dutch aircraft
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