Wilhelm Kettler

Wilhelm Kettler
Duke of Courland and Semigallia
Reign	1587–1617
Predecessor	Gotthard Kettler
Successor	Friedrich Kettler
Born	(1574-06-20)20 June 1574 Mitau, Duchy of Courland and Semigallia
Died	20 April 1640(1640-04-20) (aged 65) Kucklow, Duchy of Pomerania
Burial	Ducal crypt in the Jelgava Palace
Spouse	Sophia of Brandenburg-Prussia
Issue	Jacob Kettler
House	House of Kettler
Father	Gotthard Kettler
Mother	Anna of Mecklenburg
Religion	Lutheranism

Wilhelm Kettler (20 June 1574 in Mitau – 7 April 1640 in Kucklow) was the second Duke of Courland, a region of Latvia. Wilhelm ruled the western Courland portion of the Duchy of Courland and Semigallia while his brother Friedrich ruled the eastern Semigallia portion.

Wilhelm Kettler was the youngest son of Gotthard Kettler and his wife Anna of Mecklenburg. After their father's death in 1587, Wilhelm and his brother Friedrich inherited the Duchy of Courland. The brothers decided to divide the duchy between themselves. Wilhelm ruled the Courland portion with the seat in Kuldīga. In 1609 he married Princess Sophia of Brandenburg-Prussia (1582–1610), daughter of Albert Frederick, Duke of Prussia, receiving as a dowry the territory of Grobiņa. Due to conflicts with the nobility, he lost the duchy in 1617 and emigrated.

He died in the Kucklow abbey in Pomerania on 7 April 1640. His son, Duke Jacob Kettler of Courland, had his remains returned to Courland in 1642. He was interred in the duchy tomb on 23 February 1643.