Chalcidichthys is an extinct genus of prehistoric manefish.

[1] It contains a single species, C. malacapterygius, that lived during the Upper Miocene of Southern California.

[2] It is known from the Modelo Formation in Los Angeles County, and specimens were found during construction of a tunnel on Sepulveda Boulevard.

[3][4] It is assumed to have preyed on siphonophores, like its living relatives.

This article about a prehistoric ray-finned fish is a stub.