Monkonosaurus (meaning "Monkon lizard") is a dubious genus of herbivorous stegosaurian dinosaur from the Late Jurassic/Early Cretaceous-aged Loe-ein Formation of Tibet (or the Early Cretaceous Lura Formation of China).

Some sources place it as alive during the Oxfordian - Albian stages, around 163 - 100 million years ago,[1] although Monkonosaurus was probably only alive during the Late Jurassic (163 – 152.1 ± 0.9 million years ago), making it among the earliest known stegosaurs along with Chungkingosaurus and Bashanosaurus.

The latter was provided in 1986 when the type species Monkonosaurus lawulacus was named, the epithet referring to the Lawushan, the Lawu mountains.

The fragmentary condition of this single skeleton places doubt on the validity of this genus, with some studies concluding it is a nomen dubium.

[2] Monkonosaurus was about 5 metres (16 ft) long when fully grown.