Friedrich Kettler (disambiguation)
Friedrich Kettler is the name of the following people:
- Friedrich Kettler (1569–1642), Duke of Courland and Semigallia
- Friedrich Kasimir Kettler (1650–1698), Duke of Courland and Semigallia
- Friedrich Wilhelm Kettler (1692–1711), Duke of Courland and Semigallia
See also: