Gadara (Hebrew: גדר, romanized: Geder or Hebrew: גדרה, romanized: Gedera; Greek: Γάδαρα, romanized: Gádara), in some texts Gedaris, was an ancient Hellenistic city in what is now Jordan, for a long time member of the Decapolis city league, a former bishopric and present Latin Catholic titular see.
Its ruins are today located at Umm Qais, a small town in the Bani Kinanah Department and Irbid Governorate in Jordan, near its borders with Israel and Syria. It stood on a hill 378 metres (1,240 ft) above sea level overlooking the Yarmouk River gorge, with the Golan Heights and the Sea of Galilee well visible to the north and northwest.