Onar is a neighborhood in Siverek District, in Şanlıurfa Province, Türkiye. Onar lies at 798 m above sea level, 14.0 km from the Malatya Dağları mountains. It has 37 inhabitants. The nearest city is Siverek, 11.7 km to the southeast. Among the landmarks around are Hacıhıdır Dam (16.9 km) and Gerger Castle (25 km).