Comptonatus (meaning "the Compton thunderer") is a genus of ornithopod dinosaur from the early Cretaceous period.

The specific name, chasei, honours the late Nick Chase, who won the Palaeontological Association's Mary Anning Award in 2018 and discovered the specimen.

The cladogram from the analysis is shown below:[1] Uteodon Dakotadon Hippodraco Iguanacolossus Proa Lanzhousaurus Hypselospinus Bayannurosaurus Ouranosaurus Iguanodon Barilium Comptonatus Mantellisaurus Brighstoneus Bolong Jinzhousaurus Altirhinus Equijubus Batyrosaurus Penelopognathus Sirindhorna Hadrosauromorpha Comptonatus is one of several iguanodontians known from the Isle of Wight, distinct from Iguanodon, Brighstoneus, and Mantellisaurus.

The Wessex Formation had a warm and semi-arid Mediterranean climate, formed on alluvial meander plains.

Forests on higher ground north of the floodplain consisted of Pinophyta, Ginkgophyta, Pteridophyta, Cycadophyta.