Temistocle (Themistocles) is an opera seria in three acts by the German composer Johann Christian Bach. The Italian text is an extensive revision of the libretto by Metastasio first set by Antonio Caldara in 1736, by Mattia Verazi, court poet and private secretary to the Elector Palatine Carl Theodor. The opera was the first of two which J. C. Bach set for the Elector Palatine. Some of the music was reused from earlier works, including part of the overture from Carattaco (composed in London in 1767).