Heinrich Reimann (March 12, 1850 – May 24, 1906), was a German musicologist, organist, and composer.
Reimann studied at the University of Breslau and was awarded a degree in classical philology in 1875, having simultaneously studied organ with the Silesian composer and organist Moritz Brosig (1815–1887).
It was only in 1886 that Reimann changed his profession to music, becoming active in Berlin as an organist, choral conductor, and write on subjects from Byzantine music through Wagner and contemporary composition.
In fact, Reimann was responsible for the addition of a fourth manual to the organ in 1897 in the form of an enclosed echo division (German: Fernwerk), which spoke through a soundproof duct and stone wall to a screen directly above the nave of the church.
It was Reimann who first introduced Straube to the music of Max Reger (then a student of Hugo Riemann in composition at Weiden).