Tobias Picker is an American composer, pianist, and conductor, noted for his orchestral works Old and Lost Rivers, Keys To The City, and The Encantadas, as well as his operas Emmeline, Fantastic Mr. Fox, An American Tragedy and Lili Elbe, among many other works.

Emmeline is an opera in two acts composed by American Tobias Picker with a libretto by J. D. McClatchy. Picker's first opera, it was commissioned by the Santa Fe Opera company and premiered in 1996. Based on Judith Rossner's novel of the same name, Emmeline is an American retelling of the Oedipus myth from the mother’s viewpoint.