Mittelweser is a Samtgemeinde ("collective municipality") in the district of Nienburg, in Lower Saxony, Germany.
Its seat is in the village Stolzenau.
It was formed on 1 November 2011 when the municipality Stolzenau joined the former Samtgemeinde Landesbergen.
The Samtgemeinde Mittelweser consists of the following municipalities: This Nienburg district location article is a stub.
You can help Wikipedia by expanding it.52°32′N 9°07′E / 52.53°N 9.12°E / 52.53; 9.12