Princess Eleonore Erdmuthe Louise of Saxe-Eisenach (13 April 1662 – 9 September 1696) was a member of the House of Wettin and through her two marriages became Margravine of Brandenburg-Ansbach (from 1681 to 1686) and Electress of Saxony (from 1692 to 1694).

Eleonore Erdmuthe Louise was the eldest child of John George I, Duke of Saxe-Eisenach, and Countess Johannetta of Sayn-Wittgenstein.

[3] In Leipzig on 17 April 1692, Eleonore married secondly John George IV, Elector of Saxony[4][5] and moved with her children to Dresden, where the Saxon court was established.

The wedding was concluded at the insistence of Frederick III, Elector of Brandenburg (who wanted to secure an alliance with Saxony)[a][6] and the Dowager Electress Anna Sophie of Denmark, ostensibly to produce legitimate heirs to the Electorate of Saxony but truly to end the liaison between her son and his mistress, Magdalene Sibylle "Billa" of Neidschutz.

[10][11] The new Elector, Frederick Augustus I allowed the Dowager Electress and her children to remain in Pretzsch, where they lived until Eleonore's death two years later, on 9 September 1696.