Mittelweser (Samtgemeinde)

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.

As of 2025, the collective municipality has approximately 16,000 residents.

The Samtgemeinde Mittelweser consists of the following municipalities:

  1. Estorf
  2. Husum
  3. Landesbergen
  4. Leese
  5. Stolzenau