Chauliognathus tricolor, the tricolor soldier beetle, is a species of soldier beetle in the family Cantharidae. It has a flattened body between 6 and 16 millimeters long with a prominent red-orange prothorax behind the black head. The abdomen is yellow-orange but is mostly obscured by the metallic olive green elytra.
It is found in Eastern Australia, South Australia and the southwest part of Western Australia.