Gadara, 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.

The Decapolis was a group of ten Greek Hellenistic cities on the eastern frontier of the Roman Empire in the Southern Levant in the first centuries BC and AD. They formed a group because of their language, culture, religion, location, and political status, with each functioning as an autonomous city-state dependent on Rome. They are sometimes described as a league of cities, although some scholars believe that they were never formally organized as a political unit.