Christian Ernest II
Engraving by Johann Christoph Sysang, c. 1730–1745
Duke of Saxe-Coburg-Saalfeld
Reign	17 February 1729 – 4 September 1745
Predecessor	John Ernest IV
Successor	Francis Josias
Born	(1683-08-18)18 August 1683 Saalfeld
Died	4 September 1745(1745-09-04) (aged 62) Saalfeld
Spouse	Christiane Fredericka of Koss
House	Saxe-Coburg-Saalfeld
Father	John Ernest IV, Duke of Saxe-Coburg-Saalfeld
Mother	Sophie Hedwig of Saxe-Merseburg
Religion	Lutheranism

Christian Ernest II, Duke of Saxe-Coburg-Saalfeld (German: Christian Ernst; 18 August 1683 – 4 September 1745), was a duke of Saxe-Coburg-Saalfeld.

He was the oldest surviving son of Johann Ernst, Duke of Saxe-Coburg-Saalfeld and his first wife, Sophie Hedwig of Saxe-Merseburg.

In Naitschau on 18 August 1724, Christian Ernst married unequally with Christiane Fredericka of Koss; for this, his younger half-brother Franz Josias reclaimed the full succession of the duchy. His father, the duke Johann Ernst, determined the common government of the brothers with indivisibility of the duchy upon his death, in 1729. Christian Ernst made his residence in Saalfeld and Franz Josias moved into the Veste Coburg.

The double government soon proved impossible, and this forced the settlement of the "Coburg Eisenberg Roemhilder of Hereditary Controversy", whereby Christian Ernst received Coburg, Rodach, Mönchröden and half Neuhaus. Christian Ernst died childless and all his inheritance was taken by his half-brother, Franz Josias.

• August Beck: Christian Ernst, Herzog zu Sachsen-Saalfeld. In: Allgemeine Deutsche Biographie (ADB). Band 4, Duncker & Humblot, Leipzig 1876, S. 180.