Ernest Augustus II, Duke of Saxe-Weimar-Eisenach
| Ernest Augustus II | |
|---|---|
18th-century portrait | |
| Duke of Saxe-Weimar | |
| Reign | 1748–1758 |
| Predecessor | Ernest Augustus I |
| Successor | Charles Augustus |
| Regent | Duke Francis Josias Duke Frederick III |
| Duke of Saxe-Eisenach | |
| Reign | 1748–1758 |
| Predecessor | Ernest Augustus I |
| Successor | Charles Augustus |
| Regent | Duke Francis Josias |
| Born | 2 June 1737 Weimar |
| Died | 28 May 1758 (aged 20) Weimar |
| Spouse | |
| Issue | |
| House | Saxe-Weimar-Eisenach |
| Father | Ernest Augustus I |
| Mother | Margravine Sophie Charlotte of Brandenburg-Bayreuth |
| Religion | Lutheranism |
Ernest Augustus II Constantine (German: Ernst August II Konstantin; 2 June 1737 – 28 May 1758) was the ruling Duke of Saxe-Weimar-Eisenach from 1748 until his death in 1758.