Joachim Ernst Duke of Anhalt
- Category : 1901-births
- Type : MGP
- Profile : 6/2 - Role Model / Hermit
- Definition : Single
- Incarnation Cross : LAX Cycles 2
German nobleman, noted as the last ruler of the Duchy of Anhalt. He was the son of Duke Eduard of Anhalt (1861–1918) and Princess Louise Charlotte of Saxe-Altenburg (1873–1953).
He succeeded his father as Duke of Anhalt on 13 September 1918. However, due to his age, his uncle Prince Aribert of Anhalt was appointed regent. His brief reign came to an end on 12 November 1918, with his uncle abdicating in his name following the German revolution. The duchy became the Free State of Anhalt and is today part of the state of Saxony-Anhalt.
Duke Joachim married twice and had five children. He died on 18 February 1947, aged 46, at the Buchenwald concentration camp after World War II as a prisoner of the Soviet Union, when it was called NKVD special camp Nr. 2.