Loricatosaurus (meaning "armored lizard") is a Stegosaurid genus from Callovian-age (Middle Jurassic) rocks of England and France.

The specimen was a partial postcranial skeleton, including many vertebrae and a dorsal spine, from the Lower Callovian of Le Fresne d'Argences (Calvados), Normandy, France.

The material was later named Stegosaurus priscus (“ancient roofed lizard”) by Baron Franz Nopcsa in 1911 and Lexovisaurus by Hoffstetter, 1957 and Peter Galton, 1985.

Another referred specimen (MHBR 001), from an unnamed unit referred to as the Marnes a Belemnopsis latesulcatus Formation from the lower Callovian, Middle Jurassic of Le Fresne d’Argences, Calvados, Normandy, France, includes neck, back and tail vertebrae, a left upper arm, right thigh, shin and calf, and some armour plates.

[1] Multiple phylogenetic analyses carried out by S. Maidment and O. Mateus between 2008 and 2010 place Loricatosaurus as a basal genus within the family Stegosauridae.