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Postcranial remains of a small theropod dinosaur, including vertebrae, incomplete pubes, tibiae, an incomplete fibula, metatarsals and phalanges, from the Early Cretaceous Sao Khua Formation of Phu Wiang, Khon Kaen Province, NE Thailand, are described as a new taxonofornithomimosaur, Kinnareemimus khonkaenensis,gen.etsp.nov.Thisearly'ostrichdino- saur' is characterized by a fairly advancedmetatarsus, in which metatarsal III, although still visible proximally between metatarsals II and IV in cranial view, is markedly 'pinched' more distally and becomes triangular in cross-section. The condition of its metatarsus shows that Kinnareemimus khonkaenensis is more derived than the geologically younger primitive ornithomimosaurs Harpy- mimus and Garudimimus, but less derived than Archaeornithomimus. Its occurrence in the Early Cretaceous of Thailand suggests that advanced ornithomimosaurs may have originated in Asia.