This is a list of compositions by Swan Hennessy (1866–1929). Hennessy was an American composer of Irish family background who studied in Germany, lived in England and Italy, but spent most of his career (from about 1903) in France. He was a most accomplished composer of chamber music in many diverse instrumentations and of piano music. The following is a list of compositions in a table sorted by opus number. This is followed by a list sorted by genre.