Isaberrysaura is a genus of stegosaurian ornithischian dinosaur from the Middle Jurassic Los Molles Formation of Patagonia, Argentina.

Although initially classified as a basal neornithischian, subsequent analysis has allied it with the Stegosauria; the morphology of its skull resembles those of other members of the group.

The holotype specimen of Isaberrysaura was discovered in the marine to deltaic sediments of the Los Molles Formation, which is of Bajocian age, by Isabel Valdivia Berry, who is honoured in the generic name.

In contrast, the orbit is subcircular, not quite as dorsoventrally tall as anteroposteriorly long, smaller than the infratemporal fenestra, and only visible in lateral view.

Three datasets within the same study by Salgado et al. (2017) indicated that while it possessed the characteristics of the neornithischians and thyreophorans, it did not fit within either of those groups, representing a previously unknown morphotype within the Ornithischia as a whole.

It also remains possible that there were enzyme-producing bacteria present in the dinosaur's gut to aid in digesting tougher plant material as seeds.