Frederick IV may refer to:
- Frederick IV of Sicily (1341–1377)
- Frederick IV of Austria (1382–1439)
- Frederick IV of Naples (1452–1504)
- Frederick IV, Elector Palatine (1574–1610)
- Frederick IV of Holstein-Gottorp (1671–1702)
- Frederick IV of Denmark (1671–1730)
Famous quotes containing the word frederick:
“Up rose old Barbara Frietchie then,
Bowed with her fourscore years and ten;
Bravest of all in Frederick town,
She took up the flag the men hauled down;”
—John Greenleaf Whittier (1807–1892)