Robert Kahn (21 July 1865 – 29 May 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 German-Jewish 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.