Robert Kahn (July 21, 1865 – May 29, 1951) was a German composer, pianist, and music teacher.
Kahn was born in Mannheim, the second son of Bernhard Kahn and Emma Eberstadt. One of his seven siblings was the wealthy financier Otto Kahn whose son Roger Wolfe Kahn was a successful jazz musician, composer and aviator. His parents belonged to a distinguished family of bankers and merchants. In 1882, Kahn entered the Königlichen Hochschule für Musik in Berlin, where he studied for the next three years. Between 1885 and 1886, he continued his musical education under the tutelage of Josef Rheinberger in Munich. On a visit to Vienna the following year, Kahn met and befriended composer Johannes Brahms, who offered to make Kahn his pupil. Although Kahn declined the invitation out of diffidence, Brahms's music would exert a profound influence on his compositional style throughout his career.
After finishing his military service, Kahn worked as a freelance composer in Berlin until 1890. For the next three years he was employed as a Korrepetitor (rehearsal pianist) at the Stadttheater in Leipzig. Having been appointed lecturer in composition at his alma mater in 1894, Kahn was responsible for the training of some of the leading musical luminaries of 20th century classical music. Among his famous students were pianists Arthur Rubinstein and Wilhelm Kempff, the conductor Ferdinand Leitner, the composers Nikos Skalkottas and Günter Raphael, as well as the violinist Karl Klinger.