The Coat of arms of the Grand Duchy of Saxe-Weimar-Eisenach was created in 1815 when the area was raised to the title of Grand Duchy, and ended in 1918 with the transition of Saxe-Weimar-Eisenach into the new state of Thuringia.

The full grand ducal style was Grand Duke of Saxe-Weimar-Eisenach, Landgrave in Thuringia, Margrave of Meissen, Princely Count of Henneberg, Lord of Blankenhayn, Neustadt and Tautenburg, and this is represented in the arms: It was used on the Grand Ducal Standard c.1862 - c.1878.

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