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| Ferdinand Kettler | |
|---|---|
 Portrait by an unknown Swedish painter, 18th century | |
| Duke of Courland and Semigallia | |
| Reign | 21 January 1730– 4 May 1737 |
| Predecessor | Friedrich Wilhelm Kettler |
| Successor | Ernst Johann von Biron |
| Born | 1 November 1655 Mitau, Duchy of Courland and Semigallia |
| Died | 4 May 1737 (aged 81) Danzig, Polish–Lithuanian Commonwealth |
| Spouse | Johanna Magdalene of Saxe-Weissenfels |
| House | Kettler |
| Father | Jacob Kettler |
| Mother | Louise Charlotte of Brandenburg |
| Religion | Lutheranism |
Ferdinand Kettler (November 1, 1655 - May 4, 1737) was Duke of Courland and Semigallia from 1730 to 1737. He was married to Johanna Magdalene of Saxe-Weissenfels in 1730.