Aristosuchus is a genus of small coelurosaurian dinosaur whose name was derived from the Greek ἄριστος (meaning bravest, best, noblest) and σουχος (the Ancient Greek corruption of the name of the Egyptian crocodile-headed god Sobek).

[2] It was found in the Wealden Group dating to the Early Cretaceous (Barremian) in England, on the Isle of Wight, i.e. from about 125 million years ago.

This predator is thought to have been about 2 metres (6.6 ft) and is estimated to have weighed about 30 kilograms (66 lb).

Aristosuchus was originally named as a new species of Poekilopleuron, P. pusillus, from the Wessex Formation of the Isle of Wight.

Two ungual phalanges were found nearby, which may have been from the same animal and would suggest long claws.