Šárka, opus 51, is an opera in three acts by Zdeněk Fibich to a Czech libretto by Anežka Schulzová, his student and lover.

Fibich composed the full score over the period of 8 September 1896 to 10 March 1897.

[1] At the time, Czech audiences regarded Fibich with suspicion as being overly influenced by the music of Richard Wagner, and Fibich had selected the legend of Šárka for this operatic subject to try to counter such sentiments.

[2] The subject matter, the Bohemian legend of Šárka, which appears in 14th-century Czech literature, is related to that of Smetana's tone poem Má vlast and the opera of the same name by Janáček.

Šárka is Fibich's most popular opera and is regularly revived in the Czech Republic.