Adolf H. A. Weidig (28 November 1867, in Hamburg, Germany – 23 September 1931) was an American composer who was born and raised in Hamburg. After extensive musical studies in Europe, including at the Academy of Music, Munich,^[1] he immigrated to the United States in 1892 as a young man.

He wrote numerous pieces for orchestra, including a symphony and the tone poem Semiramis; among his chamber works are three string quartets and a string quintet. He also wrote songs. He died in Hinsdale, Illinois.^[2]

For years Weidig served as Associate Director of the American Conservatory of Music in Chicago and was Dean of the Department of Theory in the same.^[3] His composition students included harpist Helena Stone Torgerson,^[4] pianist Theodora Troendle, organist Helen Searles Westbrook, and, most notably, composer Ruth Crawford Seeger.