Otto (1 June 1815 – 26 July 1867) was a Bavarian prince who became the first modern King of Greece in 1832 under the Convention of London. He reigned until he was deposed in 1862.

The second son of King Ludwig I of Bavaria, Otto ascended the newly created throne of Greece while still a minor. His government was initially run by a three-man regency council made up of Bavarian court officials. Upon reaching his majority, Otto removed the regents when they proved unpopular with the people and he ruled as an absolute monarch. Eventually his subjects' demands for a Constitution proved overwhelming, and in the face of an armed but bloodless insurrection Otto in 1843 granted a constitution. However he rigged elections using fraud and terror.

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