Tarmstedt is a municipality in the district of Rotenburg in Lower Saxony, Germany.

Tarmstedt belonged to the Prince-Archbishopric of Bremen, established in 1180.

In 1648 the Prince-Archbishopric was transformed into the Duchy of Bremen, which was first ruled in personal union by the Swedish Crown — interrupted by a Danish occupation (1712–1715) — and from 1715 on by the Hanoverian Crown.

In 1813 the Duchy was restored to the Electorate of Hanover, which — after its upgrade to the Kingdom of Hanover in 1814 — incorporated the Duchy in a real union and the Ducal territory, including Tarmstedt, became part of the new Stade Region, established in 1823.

This Rotenburg district location article is a stub.