Hugo Chaim Adler (17 January 1894, Antwerp – 24 December 1955, Worcester, Massachusetts) was a Belgian composer, cantor, and choir conductor. Born in Antwerp to Jewish parents, Adler studied at the Hochschule für Musik Köln from 1912-1915. In 1915 he was drafted into the German Army during the First World War; serving for three years in the infantry until he was wounded at Argonne. In 1918 he was appointed cantor and teacher at St. Wendel in the Saarland. He left there in September 1921 to become second cantor at the synagogue in Mannheim, rising to head cantor there in 1933. While in Mannheim he studied music composition at the Mannheim Conservatory with Ernst Toch from 1924-1926. In 1939 he fled Germany for the United States after having been imprisoned due to his Jewish ancestry by the Nazi regime. From September 1939 until his death of cancer in December 1955 he was cantor of Temple Emanuel in Worcester, Massachusetts. He remained active as a choir conductor and composer of sacred music during these years. Several of his works were published by Sacred Music Press and Transcontinental Music Publishers in New York City. He is the father of composer and conductor Samuel Adler.