This list of placoderms is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be members of the class Placodermi. This list excludes purely vernacular terms. It includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomina dubia), or were not formally published (nomina nuda), as well as junior synonyms of more established names, and genera that are no longer considered placoderms. The modern descendants of placoderms, the bony and cartilaginous fishes, and their extinct descendants, the Acanthodii (without cartilaginous fishes), are not included here.

This list includes 334 generic names.

Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include:

Uncited genera can be attributed to: