Johann Ernest IV, Duke of Saxe-Coburg-Saalfeld (22 August 1658 in Gotha – 17 February 1729 in Saalfeld) was a reigning duke of Saxe-Coburg-Saalfeld.
| Johann Ernest IV | |
|---|---|
 | |
| Duke of Saxe-Coburg-Saalfeld | |
| Reign | 6 August 1699 – 17 February 1729 |
| Successor | Christian Ernest |
| Duke of Saxe-Saalfeld | |
| Reign | 26 March 1675 – 17 February 1729 |
| Predecessor | New creation |
| Duke of Saxe-Coburg | |
| Reign | 6 August 1699 – 17 February 1729 |
| Predecessor | Albert V |
| Born | 22 August 1658 Gotha, Saxe-Gotha, Holy Roman Empire |
| Died | 17 February 1729 (aged 70) Saalfeld, Saxe-Coburg-Saalfeld, Holy Roman Empire |
| Spouse | Sophie Hedwig of Saxe-Merseburg Charlotte Johanna of Waldeck-Wildungen |
| Issue | Princess Christiane Sophie Christian Ernest Princess Charlotte Wilhelmine Prince Wilhelm Frederick Prince Karl Ernst Princess Sophia Wilhelmina Princess Henriette Albertine Princess Louise Emilie Princess Charlotte Francis Josias Princess Henriette Albertine |
| House | Wettin |
| Father | Ernest I, Duke of Saxe-Gotha |
| Mother | Elisabeth Sophie of Saxe-Altenburg |
| Religion | Lutheran |
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