Gonsenheim (German pronunciation: [ˈɡɔnzn̩haɪm]; Rhenish Hessian: Gunsenum [ˈɡʊnzənʊm]) is a borough in the northwest corner of Mainz, Germany.

Here, in 1850, five polished flat Jadeite axes were found in the sand dunes typical of Gonsenheim, which can be assigned to the Late Neolithic period.

At Gleisberg a villa rustica with numerous building and small finds such as mosaic floors, wall plastering, remains of a Roman bath house and a water pipe belonging to it could be found.

In the valley of the Gonsbach in 2013/2014 extensive structural remains from the time around the 4th century were found during renaturation work, which could be identified by the responsible archaeologists as a stud farm, which was possibly operated by the military stationed in Mogontiacum.

Besides the old village core around St. Stephans church and the Renaissance town hall, there are the workers' quarters and mansions established in the middle of the 19th century, the tower blocks, with about 6.000 people living there, the commercial zone „Am Hemel“ and much nature like the small, but geo-ecologically and botanical supra-regionally important nature reserve of Mainz Sand Dunes „Großer Sand“ as well as parts of the Lennebergwald, the biggest connected forest in Rheinhessen.

Despite the extensive pre-Franconian history, the foundation of a permanently inhabited settlement in Gonsenheim dates back to Franconian times.

The founder was probably a Franconian nobleman named Gunzo, who founded a larger farm in the area of today's Gonsenheim as the germ cell for the later settlement.

The establishment of villages with the name ending -heim is typical for settlement foundations in the course of the so-called Frankish colonisation, which took place in the late 5th to 7th centuries.

The following communities border on Gonsenheim clockwise: in the north Mombach, in the east Hartenberg-Münchfeld, south Bretzenheim (Mainz) and Drais, in the west Finthen and northwest Budenheim.