Glyptodon (Greek for "grooved or carved tooth") was a large, armored mammal of the Glyptodontidae family, related to the armadillo, that lived during the Pleistocene Epoch. Flatter than a Volkswagen Beetle, but about the same general size and weight, Glyptodon is believed to have been an herbivore, grazing on grasses and other plants found near rivers and small bodies of water.

Its physical appearance superficially resembled the much earlier dinosaurian ankylosaurs, an example of the convergent evolution of unrelated lineages into similar forms.