Frederick I

• Frederick I (archbishop of Cologne)
• Frederick I of Austria (Habsburg)
• Frederick I of Denmark
• Frederick I of Mantua
• Frederick I of Naples
• Frederick I of Prussia
• Frederick I of Sweden
• Frederick I of Württemberg
• Frederick I, Burgrave of Nuremberg
• Frederick I, Count Palatine of Simmern
• Frederick I, Count of Berg-Altena
• Frederick I, Count of Celje
• Frederick I, Count of Vaudémont
• Frederick I, Count of Zollern
• Frederick I, Duke of Anhalt
• Frederick I, Duke of Athens
• Frederick I, Duke of Austria (Babenberg)
• Frederick I, Duke of Brunswick-Lüneburg
• Frederick I, Duke of Brunswick-Osterode
• Frederick I, Duke of Lorraine
• Frederick I, Duke of Saxe-Altenburg
• Frederick I, Duke of Saxe-Gotha-Altenburg
• Frederick I, Duke of Swabia
• Frederick I, Duke of Upper Lorraine
• Frederick I, Duke of Württemberg
• Frederick I, Elector Palatine
• Frederick I, Elector of Brandenburg
• Frederick I, Elector of Saxony
• Frederick I, Grand Duke of Baden
• Frederick I, Holy Roman Emperor
• Frederick I, Landgrave of Hesse-Homburg
• Frederick I, Margrave of Baden
• Frederick I, Margrave of Brandenburg-Ansbach
• Frederick I, Margrave of Meissen
• Frederick I, Marquess of Saluzzo
• Frederick William I (disambiguation)
• Frederick of Utrecht
• Frederik I (disambiguation)