Carl Heinrich Carsten Reinecke (June 23, 1824 – March 10, 1910) was a German composer, conductor, and pianist.

Reinecke is best known for his flute sonata "Undine", but he is also remembered as one of the most influential and versatile musicians of his time. He served as a teacher for 35 years, until 1902. His students included Edvard Grieg, Basil Harwood, Christian Sinding, Leoš Janáček, Isaac Albéniz, Johan Svendsen, Richard Franck, Felix Weingartner, Max Bruch, and Felix Fox among many others.