Back Ornithischia AF طيريات الورك Arabic Quşçanaqlılar AZ Птушкатазавыя BE অর্নিথিস্কিয়া Bengali/Bangla Ornithischia BR Ornitisquis Catalan Ornithischia CEB Ptakopánví Czech Ornithischia Danish
| Ornithischia Temporal range: Upper Triassic–Upper Cretaceous, 228–66 mya
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| Pachyrhinosaurus and Iguanodon, types of ornithischians | |
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| Order: | Ornithischia Seeley, 1888
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Ornithischia is an extinct clade of mainly herbivorous dinosaurs characterized by a pelvic structure superficially similar to that of birds.
The name Ornithischia, or "bird-hipped", reflects this similarity and is derived from the Greek stem ornith- (ὀρνιθ-), meaning "of a bird", and ischion (ἴσχιον), plural ischia, meaning "hip joint". However, birds are only distantly related to this group as birds are theropod dinosaurs.