A
- Mark Adamo (born 1962)
- John Adams (born 1947)
- John Luther Adams (born 1953)
- H. Leslie Adams (born 1932)
- Samuel Adler (born 1928)
- Bruce Adolphe (born 1955)
- James Aikman (born 1959)
- Stephen Albert (1941–1992)
- Beth Anderson (born 1950)
- Leroy Anderson (1908–1975)
- T. J. Anderson (born 1928)
- John Antes (1740–1811)
- George Antheil (1900–1959)
- Alfredo Antonini (1901–1983)
- Frederic Archer (1838–1901)
- Dominick Argento (born 1927)
- Harold Arlen (1905–1986)
- Jeff Arwady
- Robert Ashley (born 1930)
- Larry Austin (born 1930)
- Frederick Ayres (1876–1926)
Read more about this topic: List Of American Composers