Dr. Theodore Baker (born June 3, 1851 - Oct. 13, 1934) was an American music scholar and lexicographer.
He published Baker's Dictionary of Musical Terms (1895) and most notably, Baker's Biographical Dictionary of Musicians (1900), which was revised after his death by Nicolas Slonimsky and then Laura Kuhn.
After receiving his doctorate at the University of Leipzig, Baker lived in Germany until 1890, returning to the United States the following year and becoming (1892) the literary editor and translator for the music publishing house of G. Schirmer, Inc.
He remained at Schirmer until his retirement in 1926, when he returned to Dresden, Germany.