Eucercosaurus (meaning "good-tailed lizard"[1]) is the name given to a genus of ornithopod dinosaur from the Albian stage of the Early Cretaceous.

It was an ornithopod discovered in the Cambridge Greensand of England and is known from 19 centra, 3 sacrals, 4 dorsals and 12 caudals, and a neural arch found near Trumpington, Cambridgeshire.

[1][2] The type species, E. tanyspondylus, was described by British paleontologist Harry Seeley in 1879.

[4] According to a 2020 study, Eucercosaurus and Syngonosaurus were basal iguanodontians.

This article related to ornithopod dinosaurs is a stub.