Joachim Ernst
Joachim Ernst may refer to:
- Joachim Ernest, Prince of Anhalt, ruler of the Principality of Anhalt
- Joachim Ernst, Duke of Anhalt, last ruler of the Duchy of Anhalt
- Joachim Ernst, Margrave of Brandenburg-Ansbach, German nobleman
- Joachim Ernst (ski jumper), German former ski jumper, father to Gianina Ernst