| Named By: | Zhao in 1983 |
| Time Period: | 150 Ma |
| Location: | Tibet - Loe-ein/Lura Formation |
| Size: | Uncertain but roughly estimated to be about 5 meters long |
| Diet: | Herbivore |
| Fossil(s): | Partial remains, specifically a pelvis, vertebrae and three back plates |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Thyreophora | Stegosauria | |
Monkonosaurus (meaning "Monkon lizard") is a dubious genus of herbivorous stegosaurian dinosaur from the Late Jurassic (Kimmeridgian stage, around 150-155 million years ago) of Tibet (and the cretaceous Lura Formation in China). Other sources place it to Oxfordian - Albian stages (163 - 100 mya).
The genus was formalized by Zhao Xijin in 1986. The generic name refers to Markam County, also known as Monko. Zhao at the time gave neither a description, meaning the name remained a nomen nudum, nor a specific name. The latter was provided in 1986 when the type species Monkonosaurus lawulacus was named, the epithet referring to the Lawushan, the Lawu mountains. The first description was provided in 1990 by Dong Zhiming.
The holotype, IVPP V 6975, was found in a layer of the Lura Formation dating from the latest Jurassic. It consists of partial skeleton lacking the skull. It contains a pelvis with sacrum, two vertebrae and three back plates. The fragmentary condition of this single skeleton places doubt on the validity of this genus, some studies concluding it is a nomen dubium.
Monkonosaurus was about five metres long. The ilium has a length of 905 millimetres. The sacrum consists of five sacral vertebrae.
Zhao placed Monkonosaurus in the Oligosacralosauroidea. Later researchers considered it an indeterminate member of the Stegosauridae.