| Johannetta of Sayn-Wittgenstein | |
|---|---|
| Countess of Sayn-Altenkirchen | |
| Reign | 1648–1701 |
| Landgravine consort of Hesse-Braubach | |
| Tenure | 1647–1651 |
| Duchess consort of Saxe-Marksuhl | |
| Tenure | 1662–1671 |
| Duchess consort of Saxe-Eisenach | |
| Tenure | 1671–1686 |
| Born | 27 August 1632 Sayn-Wittgenstein-Sayn |
| Died | 28 September 1701 (aged 69) Jena |
| Spouse | John, Landgrave of Hesse-Braubach John George I, Duke of Saxe-Eisenach |
| Issue | Eleonore Erdmuthe Luise, Margravine of Brandenburg-Ansbach and Electress of Saxony Frederick August, Hereditary Prince of Saxe-Eisenach John George II, Duke of Saxe-Eisenach John William, Duke of Saxe-Eisenach Fredericka Elisabeth, Duchess of Saxe-Weissenfels |
| House | Sponheim |
| Father | Ernest, Count of Sayn-Wittgenstein-Sayn |
| Mother | Louise Juliane of Erbach |
Johannetta, Countess of Sayn-Wittgenstein-Sayn-Altenkirchen (27 August 1632 – 28 September 1701), was Sovereign Countess of Sayn-Wittgenstein-Sayn-Altenkirchen from 1648 to 1701. She was also Landgravine of Hesse-Braubach by marriage to John, Landgrave of Hesse-Braubach, and Duchess of Saxe-Marksuhl (later Saxe-Eisenach) by marriage to John George I, Duke of Saxe-Eisenach.