Iwan Knorr (1853–1916) was a German composer, conductor, and music educator, primarily associated with the classical music genre. He is best known for his contributions to the development of choral and orchestral music during the late Romantic period. Notable works by Knorr include his choral compositions and various orchestral pieces, with a significant emphasis on educational works for music students. His notable compositions include "The Song of the Night" and a series of orchestral suites. Knorr's impact on music is particularly evident in his role as an educator; he taught at the Hochschule für Musik in Frankfurt and influenced numerous students, thereby contributing to the musical landscape of the 20th century. His works, while not as widely recognized today, played a role in the evolution of choral and orchestral music in Germany.