Nodosaurus (meaning 'knobbed lizard') is a genus of herbivorous nodosaurid ankylosaurian dinosaur from the Late Cretaceous, the fossils of which are found exclusively in the Frontier Formation in Wyoming.

Nodosaurus grew up to roughly 4 to 6 metres (13 to 20 ft) long and it was an ornithischian dinosaur with bony dermal plates covering the top of its body, and it may have had spikes along its side as well.

[1] It perhaps ate soft plants, as it would have been unable to chew tough, fibrous ones; or alternatively it may have processed the latter with gastroliths and its enormous intestinal apparatus.

[4][9] Richard Swan Lull did a more comprehensive description of Nodosaurus in 1921, who assigned the taxa Stegopelta, Hoplitosaurus, Hierosaurus, Ankylosaurus, and placed the British Polacanthus as a relative of the family.

[9] Sauroplites Mymoorapelta Dongyangopelta Gastonia Gargoyleosaurus Hoplitosaurus Polacanthus Peloroplites Taohelong Sauropelta Acantholipan Nodosaurus Niobrarasaurus Ahshislepelta Tatankacephalus Silvisaurus