| Ketteler Kettler | |
|---|---|
 | |
| Country | Germany, Latvia, Westphalia, Prussia, Poland-Lithuania |
| Founded | 15th century |
| Founder | Gotthard Kettler (Polish branch) |
| Final ruler | Ferdinand Kettler |
| Titles | Duke of Courland and Semigallia Master of the Livonian Order |
| Deposition | 18th century |
| Cadet branches | German branch Polish branch |
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The House of Ketteler (also Kettler) is the name of an old and distinguished Baltic German noble family that originated in Westphalia.