| Christian August of Holstein-Gottorp, Prince of Eutin | |
|---|---|
 Christian August of Holstein-Gottorp, Prince of Eutin | |
| Born | 11 January 1673 |
| Died | 24 April 1726 (aged 53) |
| Spouse | |
| Issue | Adolf Frederick, King of Sweden Frederick August of Eutin Joanna Elisabeth Georg Ludwig of Holstein-Gottorp |
| House | House of Holstein-Gottorp |
| Father | Christian Albert, Duke of Holstein-Gottorp |
| Mother | Princess Frederica Amalia of Denmark |
Christian August of Holstein-Gottorp-Eutin (11 January 1673 – 24 April 1726) was a cadet of the reigning ducal House of Holstein-Gottorp who became prince of Eutin, prince-bishop of Lübeck and regent of the Duchy of Holstein-Gottorp.
He was the father of Adolf Frederick, King of Sweden, and the maternal grandfather of Catherine the Great, Empress of Russia.