1638 disestablishments in the Holy Roman Empire

Saxe-Eisenach () was an Ernestine duchy ruled by the Saxon House of Wettin. The state intermittently existed at three different times in the Thuringian region of the Holy Roman Empire. The chief town and capital of all three duchies was Eisenach.

Saxe-Coburg-Eisenach was a duchy within the Holy Roman Empire. It existed during two fairly short periods: 1572-1596 and 1633–1638. Its territory was part of the modern states of Bavaria and Thuringia.