Tarmstedt is a Samtgemeinde ("collective municipality") in the district of Rotenburg, in Lower Saxony, Germany. Its seat is in the village Tarmstedt. The Samtgemeinde Tarmstedt consists of the following municipalities: Breddorf Bülstedt Hepstedt Kirchtimke Tarmstedt Vorwerk Westertimke Wilstedt Samtgemeinden in Lower Saxony