| Gotthard Kettler | |
|---|---|
 | |
| Duke of Courland and Semigallia | |
| Reign | 28 November 1561 – 17 May 1587 |
| Successor | Friedrich Kettler |
| Born | 2 February 1517 Anröchte, Duchy of Cleves, Holy Roman Empire |
| Died | 17 May 1587 (aged 70) Mitau, Duchy of Courland and Semigallia |
| Burial | Ducal crypt in the Jelgava Palace |
| Spouse | |
| Issue | |
| House | Kettler |
| Father | Gotthard Kettler zu Melrich |
| Mother | Sophie of Nesselrode |
| Religion | Lutheranism |
Gotthard Kettler, Duke of Courland (also Godert, Ketteler; German: Gotthard Kettler, Herzog von Kurland; Latvian: Gothards Ketlers; Latin: Gothardus, etc.; 2 February 1517 – 17 May 1587) was the last Master of the Livonian Order from 1559 to 1561 and the first Duke of Courland and Semigallia from 1561 to 1587.