| Prince Frederick Ferdinand Constantin | |
|---|---|
 Prince Frederick Ferdinand Constantin, painted by Johann Georg Ziesenis | |
| Born | 8 September 1758 Weimar |
| Died | 6 September 1793 (aged 34) Wiebelskirchen, now part of Neunkirchen |
| Burial | St. George Church in Eisenach |
| House | House of Saxe-Weimar-Eisenach |
| Father | Ernest Augustus II, Duke of Saxe-Weimar-Eisenach |
| Mother | Anna Amalia of Brunswick-Wolfenbüttel |
Prince Frederick Ferdinand Constantin of Saxe-Weimar-Eisenach (8 September 1758 in Weimar – 6 September 1793 in Wiebelskirchen, now part of Neunkirchen) was a titular Duke of Saxe-Weimar-Eisenach and a major general in the army of the Electorate of Saxony. He lived during the Age of Enlightenment.