Ernest Casimir, Count of Nassau-Dietz
| Ernest Casimir | |
|---|---|
Portrait by Wybrand de Geest, c. 1630–1635 | |
| Count of Nassau-Dietz | |
| Reign | 8 October 1606 – 2 June 1632 |
| Successor | Henry Casimir I |
| Stadtholder of Friesland | |
| Reign | 13 July 1620 – 2 June 1632 |
| Predecessor | William Louis |
| Successor | Henry Casimir I |
| Stadtholder of Groningen and Drenthe | |
| Reign | 23 April 1625 – 2 June 1632 |
| Predecessor | Maurice of Orange |
| Successor | Henry Casimir I |
| Born | Ernst Casimir 22 December 1573 Dillenburg, Nassau-Dillenburg |
| Died | 2 June 1632 (aged 58) Roermond, Duchy of Guelders |
| Burial | |
| Spouse | |
| Issue | |
| House | House of Nassau-Dietz |
| Father | Johann VI, Count of Nassau-Dillenburg |
| Mother | Countess Elisabeth of Leuchtenberg |
Ernest Casimir (22 December 1573 – 2 June 1632) was a Count of Nassau-Dietz and Stadtholder of Friesland, Groningen and Drenthe.