Münster-Sarmsheim is an Ortsgemeinde – a municipality belonging to a Verbandsgemeinde, a kind of collective municipality – in the Mainz-Bingen district in Rhineland-Palatinate, Germany.

Münster-Sarmsheim lies between Bingen and Bad Kreuznach, on the river Nahe some two kilometres upstream from where it empties into the Rhine.

The winegrowing centre belongs to the Verbandsgemeinde of Rhein-Nahe, whose seat is in Bingen am Rhein, although that town is not within its bounds.

The council is made up of 21 council members, counting the part-time mayor, with seats apportioned thus: (as at municipal election held on 13 June 2004) The municipality's arms might be described thus: Per fess, Or a minster with central block and wings on each side, each of the three with a gabled roof, each wing with a flanking buttress, and each roof ensigned with a cross, the one on the central block further ensigned with the head of an abbot's staff sinister sable, all windows, two in the central block and one each in the wings, and the door in the central block of the field, and gules two arrows in saltire of the first surmounted palewise by a bunch of grapes slipped vert, the grapes three, four, three, two and one.

The Trollbachtal Nature Conservation Area harbours cliff formations from 285,000,000 years ago.