K38 may refer to: K-38 (Kansas highway) Apollo et Hyacinthus, an opera by Wolfgang Amadeus Mozart , a corvette of the Royal Navy , a Hunt-class destroyer of the Israeli Navy K-38 trailer, an American military trailer K38 Water Safety, an American training organization Opel Kadett K38, a German automobile Potassium-38, an isotope of potassium Smith & Wesson Model 14, originally the K-38 Target Masterpiece Smith & Wesson Model 15, originally the K-38 Combat Masterpiece Washington County Memorial Airport, in Kansas