Albert Hermann Dietrich (28 August 1829 – 20 November 1908), was a German composer and conductor.
From 1851 he studied composition with Robert Schumann in Düsseldorf, where in October 1853 he first met Brahms and collaborated with Schumann and Brahms on the 'F-A-E' Sonata for Joseph Joachim (Dietrich composed the substantial first movement).
Dietrich was also instrumental in arranging for the premiere of Brahms's German Requiem at Bremen in 1868.
Dietrich's own works include an opera Robin Hood, a Symphony in D minor (1869, dedicated to Brahms),[1][2] a Violin Concerto in the same key (composed for Joseph Joachim but premiered in 1874 by Johann Lauterbach), a Cello Concerto, Horn Concerto, choral works and several chamber compositions including two piano trios.
Dietrich's Recollections of Brahms, published in Leipzig in 1898, was translated into English the following year and remains an important biographical source.