Charonosaurus (/kəˌroʊnəˈsɔːrəs/ kə-ROH-nə-SOR-əs; meaning "Charon's lizard") is a genus of dinosaur whose fossils were discovered by Godefroit, Zan & Jin in 2000, on the south bank of the Amur River, dividing China from Russia.

Adult and juvenile hadrosaur remains discovered in the same area and formation likely represent the same taxon and supply information on most of the postcranial skeleton; the femur length was up to 1.35 m (4.5 ft).

The partial skull resembles that of Parasaurolophus and probably had a similar long, backward-projecting hollow crest, indicated by the highly modified dorsal surface of the frontal bones.

The holotype material (specimen number CUST J-V1251-57), a fragmentary skull, was described as Charonosaurus jiayinensis by Pascal Godefroit, Shuqin Zan and Liyong Jin in 2000.

[3] A cladistic analysis in 2000 by Pascal Godefroit, Shuqin Zan and Liyong Jin based on 33 skull, tooth, and postcranial features shows that Charonosaurus jiayinensis could be phylogenetically more closely related to Parasaurolophus than to any other lambeosaurine.

These taphonomic features indicate that the thanatocoenosis formed in a river or stream environment with relatively strong currents, causing dinosaur carcasses to be concentrated and piled up at a low point in the landscape at the time.