Obertshausen (German: [oː.bɛʁt͡s.ˈhaʊ̯.zn̩] ⓘ) is a town in the Offenbach district in the Regierungsbezirk in the state of Hessen, Germany.

In 1069, Heinrich IV donated to Saint Jacob's Monastery in Mainz some newly cleared land in the Wildbann Dreieich (a royal hunting forest).

The Lords of Eppstein, Ullrich von Hanau and Archbishop Conrad III of Mainz were some of the land's owners.

In 1425, Hausen and Obertshausen, as part of the Amt of Steinheim, w sold by the Lords of Eppstein to Electoral Mainz.

In 1806, the Schönborn Amt of Heusenstamm with Hausen and Obertshausen was mediatized into the Principality of Isenburg, which was in turn mediatised ten years later.

From the Middle Ages until 1819, Obertshausen and Hausen belonged to the Biebermark, an area held in common with several other villages.

On 29 September 1979, the Hesse state government granted Obertshausen town rights.

The most recent mayors were:[1] The town’s arms might be described thus: Party per fess abased dancetty of three, gules a lion passant crowned Or, his paws on the peaks of the parting, argent in base an oak sprig with two leaves and one acorn vert.

Originally opened under the name Atlantis, after the operator's insolvency in 2005 it became part of the monte mare Group.

There is also a sport centre at the Waldschwimmbad ("Forest swimming pool") Obertshausen has 124 registered clubs.

For a long time Obertshausen, alongside Offenbach am Main, was a national centre for leather goods production.