Wilhelm Kettler

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(1640-04-07) (aged 65) Kucklow, Duchy of Pomerania
Burial	Ducal crypt in the Jelgava Palace
Spouse	Duchess Sophie of Prussia ​ ​ (m. 1609; died 1610)​
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.