K33 or K-33 may refer to: K-33 (Kansas highway) K-33 truck, an American military truck , a corvette of the Swedish Navy Kissaviarsuk-33, a sports club from Greenland Kyrie in F major, K. 33, by Wolfgang Amadeus Mozart Potassium-33, an isotope of potassium Salem Memorial Airport, in Dent County, Missouri, United States
K3,3, the complete bipartite graph on 3 vertices