Kalmar "iyali Hadrosauridae" tana nufin dangin taxonomic na dinosaur ornithischian da suka rayu a lokacin Late Cretaceous, kimanin shekaru 100 zuwa 66 da suka wuce. Hadrosaurids, wanda kuma aka sani da dinosaur "duck-billed", wani rukuni ne daban-daban na dinosaurs na herbivorous wanda ke da nau'i mai ban sha'awa, mai tsayi mai tsayi wanda yayi kama da takardun kudi na agwagwa na zamani. Sun kasance huɗu, tare da ƙaƙƙarfan ƙafafu, ginshiƙai, kuma yawanci an rufe jikinsu da faranti ko sikeli. Wasu nau'ikan hadrosaurids, irin su Edmontosaurus da Parasaurolophus, suna cikin manyan dinosaur da suka taɓa rayuwa. Iyalin Hadrosauridae wani ɓangare ne na babban tsari na Ornithischia, wanda ya haɗa da duk dinosaur na ganye masu kama da kwatangwalo.