Friedrich Kettler (Latvian: Frīdrihs Ketlers 25 November 1569 Mītava (German Mitau now Jelgava) – 17 August 1642) was Duke of Courland (Latvian: Kurzeme now part of Latvia) from 1587 to 1642.He was the son of Gotthard Kettler the first Duke of Courland. Until 1616 he ruled only the eastern Zemgale portion of the Duchy of Courland while his younger brother Wilhelm Kettler ruled the western Courland portion.
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