Nanchangosaurus is an extinct genus of aquatic reptiles native to the middle Triassic of China.

It was about more than 40 cm (16 in) in length,[1][2] and probably fed on fish or used its long jaws to probe for aquatic invertebrates.

It had a fusiform body, similar to a dolphin or an ichthyosaur, paddle-like limbs, with forelimbs being larger than hindlimbs, and a crocodilian-like tail for swimming through the water.

It had bony scutes on its back, like an alligator, but had a long snout filled with teeth, like an ichthyosaur or a river dolphin.

Some people even put them in the Eosuchia, a group of early diapsid reptiles.