August Enna (1859-1939) was a Danish composer, known mainly for his operas.
Enna was born in Denmark, but his ethnic origins lay in the town of Enna in Sicily. His first major success as a composer was The Witch (1892), which was followed by several popular operas, songs, and a violin concerto. Strongly influenced by Wagner's music, he would himself be an influence on Danish composers such as Carl Nielsen.