Ottokar may refer to:
- Kings of Bohemia, members of the Přemyslid dynasty
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- Ottokar I of Bohemia, died 1230
- Ottokar II of Bohemia, died 1278
- Four Styrian margraves of the dynasty of the Otakars
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- Ottokar I, Margrave of Styria, died 1064
- Ottokar II, Margrave of Styria, died 1122
- Ottokar III, Margrave of Styria, died 1164
- Ottokar IV, Duke of Styria, 1192
- Count Ottokar Czernin, diplomat/politician in the Austro-Hungarian monarchy
- Ottakar's (a chain of bookshops in the United Kingdom)
- The fictional King Ottokar IV of Syldavia, from the Tintin book King Ottokar's Sceptre
- Ottakring