Fennimore und Gerda (subtitled Two Episodes from the Life of Niels Lyhne in Eleven Pictures, RT I/8) is a German-language opera with four interludes, by the English composer Frederick Delius.

In neither German nor English is the libretto highly regarded; rather, the work is considered an "orchestral opera", limited in its dramatic appeal but voluptuous and engaging in its instrumental texture.

[1] Delius began writing Fennimore und Gerda in 1908; he finished in 1910, but the premiere, intended for the Cologne Opera, was delayed by the First World War and did not take place until 21 October 1919, and then by the Oper Frankfurt.

[2] Two cousins, the writer Niels Lyhne and the painter Erik Refstrup, are in love with the consul's daughter, Fennimore.

She chooses Erik but the marriage begins to break down as a result of the artist's drinking and Fennimore embarks on an affair with Niels.