Enno III, Count of East Frisia
| Enno III | |
|---|---|
| Count of East Frisia Lord of Esens, Stedesdorf and Wittmund | |
Enno III, Count of East Frisia | |
| Count of East Frisia | |
| Reign | 1 March 1599 - 19 August 1625 |
| Predecessor | Edzard II |
| Successor | Rudolf Christian |
| Alongside | Catherine (1599–1610) |
| Count of Rietberg | |
| Reign | 13 July 1584 - 26 May 1586 |
| Predecessor | Armgard of Rietberg |
| Successor | Sabina Catharina of East Frisia Agnes of East Frisia |
| Alongside | Walburgis of Rietberg |
| Lord of Esens, Stedesdorf and Wittmund | |
| 1st reign | 28 January 1581 - 26 May 1586 |
| Predecessor | Walburgis of Rietberg (as sole ruler) |
| Successor | Sabina Catharina of East Frisia Agnes of East Frisia |
| Alongside | Walburgis of Rietberg |
| 2nd reign | 28 January 1600 - 19 August 1625 |
| Predecessor | Sabina Catharina of East Frisia Agnes of East Frisia |
| Successor | Rudolf Christian |
| Born | 30 September 1563 Aurich |
| Died | 19 August 1625 (aged 61) Leerort |
| Spouse | Walburgis of Rietberg Anna of Holstein-Gottorp |
| House | Cirksena |
| Father | Edzard II, Count of East Frisia |
| Mother | Catherine of Sweden |
Enno III of Ostfriesland or Enno III of East Frisia (30 September 1563, Aurich – 19 August 1625) was a Count of Ostfriesland from 1599 to 1625 from the Cirksena family. His reign was marked by political conflict with the estates and the city of Emden, deepening dependence on the Dutch Republic, and severe financial and territorial setbacks during the early phases of the Thirty Years’ War.