King Otto may refer to:
- Otto of Greece (1815 – 1867), first modern king of Greece from 1833 to 1862.
- Otto of Bavaria (1848 – 1916), King of Bavaria from 1886 to 1913 and nephew of the above
- Otto IV, Holy Roman Emperor, (1175 or 1176 – 1218), one of two rival kings of the Holy Roman Empire
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