| Ernest Frederick | |
|---|---|
| Duke of Saxe-Coburg-Saalfeld | |
| Reign | 16 September 1724 – 8 September 1800 |
| Predecessor | Francis Josias |
| Successor | Francis |
| Born |
8 March 1724 Saalfeld, Saxe-Coburg-Saalfeld, Holy Roman Empire |
| Died | 8 September 1800 (aged 76) Coburg, Saxe-Coburg-Saalfeld, Holy Roman Empire |
| Spouse | Sophia Antonia of Brunswick-Wolfenbüttel |
| Issue |
Francis Prince Karl Wilhelm Princess Fredericka Princess Caroline Prince Ludwig Karl Prince Ferdinand August Prince Frederick |
| House | House of Wettin |
| Father | Francis Josias, Duke of Saxe-Coburg-Saalfeld |
| Mother | Anna Sophie of Schwarzburg-Rudolstadt |
| Religion | Lutheranism |
Ernest Frederick, Duke of Saxe-Coburg-Saalfeld (8 March 1724 in Saalfeld – 8 September 1800 in Coburg), was a Duke of Saxe-Coburg-Saalfeld.
He was the eldest son of Francis Josias, Duke of Saxe-Coburg-Saalfeld and Anna Sophie of Schwarzburg-Rudolstadt. He is a patrilineal ancestor of Queen Elizabeth II of the United Kingdom.
Ernest Frederick succeeded his father in the Duchy of Saxe-Coburg-Saalfeld when he died in 1764 and established his definitive residence shifted in Coburg. Because of the high indebtedness of the duchy he was compelled by Emperor Joseph II in 1773 to work with a Debit commission—an obligatory administration of debts assigned by the emperor—for over thirty years.
In Wolfenbüttel on 23 April 1749 Ernest Frederick married with Sophia Antonia of Brunswick-Wolfenbüttel. They had seven children: