Oioceros is an extinct genus of spiral-horned antelope from the late Miocene. Its fossils have been found in Greece, China, Iran, and Africa. It was first discovered by Wagner in 1857, and contains nine species, O. rothii, O. atropatenes, O. jiulongkouensis, O. noverca, O. robustus, O. stenocephalus, O. lishanensis, O. wegneri, and O. tanyceras. Former species include O. grangeri (Pilgrim, 1934), now recognized as the genus Sinomegoceros, and O. xiejiaensis (Li and Qui; 1980), now recognized as the genus Sinopalaeoceros. Oioceros somewhat resembled a gazelle.