- Source: K33
K33 or K-33 may refer to:
K-33 (Kansas highway)
K-33 truck, an American military truck
HSwMS Härnösand (K33), 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
Soviet submarine K-33
K3,3, the complete bipartite graph on 3 vertices