Landesbergen is a former Samtgemeinde ("collective municipality") in the district of Nienburg, in Lower Saxony, Germany. Its seat was in the village Landesbergen. At the 1 November 2011 local government reform, the Samtgemeinde Landesbergen and the municipality Stolzenau formed the new Samtgemeinde Mittelweser. The Samtgemeinde Landesbergen consisted of the following municipalities: Estorf Husum Landesbergen Leese Former Samtgemeinden in Lower Saxony