What types of dinosaurs are herbivores?

Some types of theropods were herbivores, such as therizinosaurs. Sauropods were herbivores. All dinosaurs belonging to the group Ornithischia (bird-hipped dinosaurs) were plant eaters. These include hadrosaurs, iguanodonts, stegosaurs, ankylosaurs, ceratopsians, and pachycephalosaurs.