| Fredericka Elisabeth of Saxe-Eisenach | |
|---|---|
 | |
| Duchess consort of Saxe-Weissenfels | |
| Tenure | 1698–1712 |
| Born | 5 May 1669 Altenkirchen |
| Died | 12 November 1730 (aged 61) Langensalza |
| Spouse | Johann Georg, Duke of Saxe-Weissenfels |
| Issue | Johanna Magdalene, Duchess of Courland and Semigallia |
| House | Wettin |
| Father | John George I, Duke of Saxe-Eisenach |
| Mother | Johannetta of Sayn-Wittgenstein |
Fredericka Elisabeth of Saxe-Eisenach (5 May 1669 – 12 November 1730), was a German noblewoman member of the House of Wettin and by marriage Duchess of Saxe-Weissenfels.
Born in Altenkirchen, she was the seventh of eight children born from the marriage of John George I, Duke of Saxe-Eisenach and Johannetta, Countess of Sayn-Wittgenstein-Sayn-Altenkirchen. From her seven older and younger siblings four survive adulthood: Eleonore Erdmuthe Luise (by her two marriages Margravine of Brandenburg-Ansbach and Electress of Saxony), Frederick August, Hereditary Prince of Saxe-Eisenach, John George II, Duke of Saxe-Eisenach and John William, Duke of Saxe-Eisenach.