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
Topics referred to by the same termThis disambiguation page lists articles about people with the same name. If an internal link led you here, you may wish to change the link to point directly to the intended article.