Ernest Frederick I, Duke of Saxe-Hildburghausen

Ernst Frederick I, Duke of Saxe-Hildburghausen (b. Gotha, 21 August 1681 - d. Hildburghausen, 9 March 1724), was a duke of Saxe-Hildburghausen.

He was the eldest son of Ernst, Duke of Saxe-Hildburghausen and Sophie of Waldeck.

After the death of his father, in 1715, he inherited the duchy of Saxe-Hildburghausen.

In Erbach on 4 February 1704, Ernst Frederick married with Sofie Albertine of Erbach-Erbach. They have ten children:

1. Ernst Ludwig Hollandinus (b. Hildburghausen, 24 November 1704 - d. Hildburghausen, 26 November 1704).
2. Sophie Amalie Elisabeth (b. Hildburghausen, 5 October 1705 - d. Hildburghausen, 28 February 1708).
3. Ernst Ludwig (b. Hildburghausen, 6 February 1707 - d. Hildburghausen, 17 April 1707).
4. Ernst Frederick II, Duke of Saxe-Hildburghausen (b. Hildburghausen, 17 December 1707 - d. Hildburghausen, 13 August 1745).
5. Frederick August (b. Hildburghausen, 8 May 1709 - d. Hildburghausen, 1710).
6. Ludwig Frederick (b. Hildburghausen, 11 September 1710 - d. Nimwegen, 10 June 1759), married on 4 May 1749 to Christine Luise von Holstein-Plön. This marriage was childless.
7. Elisabeth Albertine (b. Hildburghausen, 3 August 1713 - d. Neustrelitz, 29 June 1761), married on 5 May 1735 to Karl of Mecklenburg-Strelitz, Herr of Mirow.
8. Emanuel Friedrich Karl (b. Hildburghausen, 26 March 1715 - d. Hildburghausen, 29 June 1718).
9. Georg Friedrich Wilhelm (b. Hildburghausen, 15 July 1720 - d. Hildburghausen, 10 April 1721).
10. Elisabeth Sophie (b. Hildburghausen, 13 September 1717 - d. Hildburghausen, 14 October 1717).