St. Emmeran, Mainz, Gothic church in Mainz, Germany

St. Emmeran is a Gothic church in Mainz with a Romanesque bell tower from the late 12th century. The nave, built around 1300, is a three-aisled basilica with five bays and a choir. The interior has white plaster walls, orange columns with white bands, and a ribbed vault; the floor was raised by over a meter in 1723 or 1760.

The building occupies a site connected to a Roman road and a legionary camp dating back to the early centuries. The church first appeared in written records in 1220 under the name San Heimerammi.

St. Emmeran is today the church of Mainz's Italian Catholic community, which holds its services here. The parish was formerly the largest in Mainz by area, and the church is due to be given up from 2027 under the diocese's parish reorganisation. The patron is Emmeram of Regensburg, martyred on 22 September 652; Mainz keeps his feast on 26 September because the 22nd was already taken by St Maurice.

St. Emmeran stands on Emmeransstraße, its south aisle following the street's slight curve; the east side borders Am Kronberger Hof, the former churchyard. The nave axis deviates about 33 degrees from north, probably because of the old Roman road beneath it. The floor was raised by more than a metre around 1723 or 1760, so the nave now reaches only 6.60 m to the vault crown.

The Rococo pulpit seen in many older photographs is no longer here: it was moved to St. Quintin. During the Second World War, Fritz Arens had it and the 1758 altarpiece by Franz Anton Maulbertsch, measuring 5 by 3 metres, taken to the cathedral crypt for safekeeping.