K40 may refer to:
- HMS Peony (K40), a corvette of the Royal Navy
- INS Eilat (K-40), a destroyer of the Israeli Navy
- INS Veer (K40), a corvette of the Indian Navy
- Piano Concerto No. 3 (Mozart), by Wolfgang Amadeus Mozart
- Potassium-40, an isotope of potassium
- Redmi K40, a smartphone
- Toyota K40 transmission
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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