Charles Martin Tornov Loeffler (January 30, 1861 – May 19, 1935) was a German-born American violinist and composer.
Throughout his career Loeffler claimed to have been born in Mulhouse, Alsace and almost all music encyclopedias give this fabricated information. In his lifetime articles were published dissecting his "typically Alsatian" temperament. In fact, as his biographer Ellen Knight has established, he was German—indeed a Prussian, and a Berliner on both sides of his family, born Martin Karl Löffler in Schöneberg near Berlin. He turned against Germany when the Prussian authorities imprisoned his father, an agricultural chemist and author of Republican ideals. (Loeffler senior wrote journalism under the name 'Tornov' or 'Tornow', and his son sometimes used this as one of his middle names.) Loeffler was only about 12 when his father was sent to prison, where the man died of stroke before he was to be released. Before his father's arrest the family had moved around a good deal, including a period in Alsace, and then to Smiela near Kiev, while Loeffler was still a small child. Soon thereafter the family moved from Kiev to a small town in Hungary, Debreczin, where father taught at the Royal Academy of Agriculture Later they lived in Hungary and Switzerland.
Loeffler decided to become a violinist and studied in Berlin with Joseph Joachim, Friedrich Kiel and Woldemar Bargiel, then with Joseph Massart (and composition with Ernest Guiraud) in Paris. He played with the Pasdeloup Orchestra and in 1881 emigrated to the United States, where he joined the Boston Symphony Orchestra and shared the first desk with the concertmaster from 1882 to 1903. He was on the board of directors of the Boston Opera Company when it started operations in 1908.
He first appeared as a violinist-composer with the orchestra in 1891 with the performance of his suite Les Vieilles d'Ukraine, and his works were performed regularly by the Boston Symphony (and by other American orchestra) for the rest of his life.