Back Guillem Kettler de Curlàndia Catalan Wilhelm Kettler German Γουλιέλμος Κέττλερ Greek Guillermo Kettler Spanish Wilhelm Kettler Estonian Guillaume Kettler French Wilhelm Kettler Italian ヴィルヘルム・ケトラー Japanese Vilhelmas Ketleris Lithuanian Vilhelms Ketlers Latvian/Lettish
| Wilhelm Kettler | |
|---|---|
| Duke of Courland and Semigallia | |
 | |
| Duke of Courland | |
| Reign | 1587–1617 |
| Predecessor | Gotthard Kettler |
| Successor | Friedrich Kettler |
| Born | 20 June 1574 Mitau, Duchy of Courland and Semigallia |
| Died | 7 April 1640 (aged 65) Kucklow, Duchy of Pomerania |
| Burial | Ducal crypt in the Jelgava Palace |
| Spouse | |
| Issue | Jacob, Duke of Courland |
| House | Kettler |
| Father | Gotthard Kettler |
| Mother | Anna of Mecklenburg |
| Religion | Lutheranism |
Wilhelm Kettler (20 June 1574 – 7 April 1640) was the Duke of Courland, a Baltic German region in today's Latvia. Wilhelm ruled the western Courland portion of the Duchy of Courland and Semigallia, while his brother Friedrich ruled the eastern Semigallia portion.