Tuojiangosaurus (meaning "Tuo River lizard") is a genus of herbivorous stegosaurian dinosaur from the Late Jurassic Period, recovered from the Upper Shaximiao Formation of what is now Sichuan Province in China.

The teeth have a thick base, cingulum, merging at the inside into a triangular vertical median ridge.

Those at the neck and front trunk were rounded or pear-shaped; the plates at the rear back became more triangular and pointed.

Tuojiangosaurus had at least two outward-pointing, rather robust, spikes on each side of the end of the tail, angled at approximately 45 degrees to the vertical.

In addition, a mounted cast (NHMUK PV R 12158) is on display at the Natural History Museum, in London.

A cast of the original fossilised dinosaur skeleton, found at Wujiaba Quarry 1977 is also on display at Bolton Museum, United Kingdom.

[6] In 2004, a cladistic analysis by Galton recovered Tuojiangosaurus in a rather derived position, as a sister species of Chialingosaurus.

[5] An analysis by Octávio Mateus, Maidment, and Nicolai Christiansen, published in 2009, found that Tuojiangosaurus fell outside of Stegosauridae, though its exact position in Stegosauria (either as an early branching member of the group or a later branching species closer to stegosaurids) was uncertain due to the relatively fragmentary nature of the remains.