Frederick William I

Frederick William I (German: Friedrich Wilhelm I) may refer to:

• Frederick William I, Duke of Saxe-Weimar (1562–1602)
• Frederick William, Elector of Brandenburg, the "Great Elector" of Brandenburg-Prussia (1620–1688)
• Frederick William I, Duke of Schleswig-Holstein-Sonderburg-Beck (1682–1719)
• Frederick William I of Prussia (1688–1740)
• Frederick William, Elector of Hesse (1802–1875)

See also

• Frederick William (disambiguation)
• Friedrich Wilhelm (disambiguation)