Otto I (disambiguation)
Otto I may refer to:
- Otto I, Duke of Saxony (d. 912)
- Otto I, Holy Roman Emperor (912–973)
- Otto I, Duke of Swabia and Bavaria (955–982)
- Otto I of Montferrat (d. 991)
- Otto I, Duke of Carinthia (d. 1004)
- Otto I, Margrave of Meissen (d. 1067)
- Otto I of Oldenburg (before 1101)
- Otto I, Duke of Bavaria (1117–1183)
- Otto I, Margrave of Brandenburg (c. 1128–1184)
- Otto I, Count of Burgundy (c. 1170–1200)
- Otto I of Guelders (1150–1207)
- Otto I, Duke of Brunswick-Lüneburg (1204–1252)
- Otto I of Nassau (c. 1247–1290)
- Otto I, Landgrave of Hesse (c. 1272–1328)
- Otto I of Greece (1815–1867)
- Otto I of Bavaria (1848–1916)
- Otto I of Austria (1912–2011)
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