
- Type of dinosaur:
- armoured dinosaur
- Length:
- 5.0m
- Diet:
- herbivorous
- When it lived:
- Early Cretaceous, 150-135 million years ago
- Found in:
- England,
- United Kingdom
A specimen of Hylaeosaurus was one of the 3 fossils first identified as dinosaurs by Richard Owen in 1841.

Taxonomic details
- Taxonomy:
- Dinosauria, Ornithischia, Thyreophora, Ankylosauria
- Named by:
- Mantell (1833)
- Type species:
- armatus
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