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Temporal range: Upper Cretaceous
Skeleton reconstruction
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Suborder: Thyreophora
Infraorder: Ankylosauria
Family: Ankylosauridae
Subfamily: Ankylosaurinae
Genus: Pinacosaurus

Pinacosaurus ("plank lizard") is a genus of medium-sized ankylosaur dinosaurs from the Upper Cretaceous of Mongolia and China. It lived about 80–75 million years ago. Pinacosaurus had between two and five additional holes near each nostril, which have not been explained.