Ottokar is the medieval German form of the Germanic name Audovacar.

People with the name Ottokar include:

• Two kings of Bohemia, members of the Přemyslid dynasty
  • Ottokar I of Bohemia (c. 1155–1230)
  • Ottokar II of Bohemia (c. 1223–1278)
• Four Styrian margraves, members of the Otakar dynasty
  • Ottokar I of Styria (died 1075)
  • Ottokar II of Styria (died 1122)
  • Ottokar III of Styria (died 1164)
  • Ottokar IV, Duke of Styria (1163–1192)
• Ottokar Chiari (1853–1918), Austrian laryngologist
• Ottokar Czernin (1872–1932), Austro-Hungarian diplomat
• Ottokar Domma (1924–2007), German journalist and writer
• Ottokar Fischer (1873–1940), Austrian magician
• Ottokar Lorenz (1832–1904), Austrian-German historian and genealogist
• Ottokar Nováček (1866–1900), Austro-Hungarian violinist
• Ottokár Prohászka (1858–1927), Hungarian Roman Catholic theologian and bishop
• Ottokar Runze (1925–2018), German film producer
• Ottokar Tumlirz (1856–1928), Austrian physicist
• Ottokar Weise (fl. 1900), German Olympic sailor

Fictional characters

• King Ottokar IV of Syldavia, from the Tintin comic book King Ottokar's Sceptre
• The prince in Carl Maria von Weber's opera Der Freischütz

• Otakar