Frederick Charles Adler (usually known as F. Charles Adler) (born on 2 July 1889 in London and died 16 February 1959 in Vienna) was an English-German conductor. Adler studied with Gustav Mahler and served as chorus master at the premiere of Mahler's Eighth Symphony. He was held at Ruhleben internment camp during World War I. He worked as a conductor in Germany in the 1920s, and emigrated to the U.S. in 1933. He made many recordings of the works of Mahler and Anton Bruckner. He made the first commercial recordings of Mahler's Third and Sixth symphonies. His recordings of Bruckner symphonies are unusual in that they use the first published editions rather than the later critical editions. (Hans Knappertsbusch was the only other major conductor to stick with the first editions consistently.)