Carl Ernst Naumann (15 August 1832 – 15 December 1910) was a German organist, composer, conductor, editor, arranger and musicologist. He is best known now as an arranger and editor of the music of J.S. Bach, Mozart and Mendelssohn. He was a friend of Schumann and Brahms, and conducted the first performance of the latter's Alto Rhapsody in 1870.