Frederick I may refer to:
- Frederick of Utrecht or Frederick I (815/16–834/38), Bishop of Utrecht
- Frederick I (Archbishop of Cologne) (c. 1075–1171)
- Frederick I, Holy Roman Emperor (1122–1190); "Frederick Barbarossa"
- Frederick I, Duke of Austria (Babenberg) (c.1175–1198)
- Frederick I of Austria (Habsburg) (1286–1330); "Frederick the Fair"
- Frederick I, Elector of Saxony (1370–1428)
- Frederick I, Elector of Brandenburg (1371–1440), also Burgrave of Nuremberg (as Frederick VI)
- Frederick I, Elector Palatine (1449–1476)
- Frederick I of Denmark (1471–1533)
- Frederick I, Duke of Württemberg (1557–1608)
- Frederick I, Duke of Saxe-Gotha-Altenburg (1646–1691)
- Frederick I of Prussia (1657–1713)
- Frederick I of Sweden (1676–1751)
- Frederick I of Württemberg (1754–1816)
- Frederick I, Duke of Anhalt (1831-1904)
Famous quotes by frederick i:
“Our work ... is to present things that are as they are.”
—Frederick II Hohenstaufen (11941250)