Untermosel is a former Verbandsgemeinde ("collective municipality") in the district Mayen-Koblenz, in Rhineland-Palatinate, Germany. It is situated along the lower course of the Mosel, south-west of Koblenz. The seat of the municipality was in Kobern-Gondorf. On 1 July 2014 it merged into the new Verbandsgemeinde Rhein-Mosel.
The Verbandsgemeinde Untermosel consisted of the following Ortsgemeinden ("local municipalities"):
Coordinates: 50°18′17″N 7°27′26″E / 50.30472°N 7.45722°E