Johann Baptist Joseph Maximilian Reger (March 19, 1873 ? May 11, 1916) was a German composer, organist, pianist and teacher. Born in Brand, Bavaria, Reger studied music in Munich and Wiesbaden with Hugo Riemann. In 1901 he settled in Munich, where he taught organ and composition, and from 1907 he worked in Leipzig, where he was music director of the university until 1908 and professor of composition at the conservatoire until his death. He was also active internationally as a conductor and pianist in that period of time. Among his students there were Joseph Haas and George Szell.
From 1911 he conducted the court orchestra at Meiningen until it was disbanded in 1914, when he moved to Jena. He died of a heart attack in Leipzig in 1916, aged 43.