Wilhelm Grosz (11 August 1894 – 10 December 1939) (sometimes credited as Hugh Williams) was an Austrian composer, pianist, and conductor. Wilhelm Grosz was born in Vienna. He studied music with Richard Robert, Franz Schreker and Guido Adler. In 1921 he was appointed conductor of the Mannheim Opera, but returned to Vienna in 1922, where he worked as a pianist and composer. From 1927 he was the artistic manager of the Ultraphone Gramophone company in Berlin. In 1933 he became conductor of the Kammerspiele Theater in Vienna. He died in 1939 in New York City.