Ornithopoda (gr. "pie de ave") es un infraorden de dinosaurios ornitisquios neornitisquios, que vivieron desde el Jurásico inferior hasta el Cretácico superior (hace aproximadamente 197 y 66 millones de años, desde el Hetangiano hasta el Maastrichtiense), en lo que hoy es América, Asia, África, Europa, Oceanía y la Antártida.

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Ornithopods (/ɔːrˈnɪθəˌpɒdz, ˈɔːrnɪ-/) or members of the clade Ornithopoda (/ˌɔːrnɪˈθɒpədə/ or /ɔːrˌnɪθəˈpoʊdə, ˌɔːrnɪ-/) are a group of ornithischian dinosaurs that started out as small, bipedal running grazers, and grew in size and numbers until they became one of the most successful groups of herbivores in the Cretaceous world, and dominated the North American landscape. Their major evolutionary advantage was the progressive development of a chewing apparatus that became the most sophisticated ever developed by a non-avian dinosaur, rivaling that of modern mammals such as the domestic cow. They reached their apex in the duck-bills (hadrosaurs), before they were wiped out by the Cretaceous–Paleogene extinction event along with all other non-avian dinosaurs. Members are known from all seven continents, though they are generally rare in the Southern Hemisphere.

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