• Mary Anne à Beckett (1817–1863)
• Michel van der Aa (born 1970)
• Thorvald Aagaard (1877–1937)
• Truid Aagesen (fl. 1593–1625)
• Heikki Aaltoila (1905–1992)
• Juhan Aavik (1884–1982)
• Evaristo Felice Dall'Abaco (1675–1742)
• Joseph Abaco (dall'Abaco) (1710–1805)
• Antonio Maria Abbatini (c. 1595–1680)
• Gamal Abdel-Rahim (1924–1988)
• Mohamed Abdelwahab Abdelfattah (born 1962)
• Keiko Abe (born 1937)
• Rosalina Abejo (1922–1991)
• Carl Friedrich Abel (1723–1787)
• Clamor Heinrich Abel (1634–1696)
• Ludwig Abel (1835–1895)
• Mark Abel (born 1948)
• Michael Abels (born 1962)
• Peter Abelard (1079–1142)
• Nicanor Abelardo (1893–1934)
• David Abell (died c. 1576)
• John Abell (1653–after 1724)
• Walter Abendroth (1896–1973)
• Jan Håkan Åberg (born 1916)
• Lasse Åberg (born 1940)
• Johann Joseph Abert (1832–1915)
• 4th Earl of Abingdon (Willoughby Bertie) (1740–1799)
• Peter Ablinger (born 1959)
• Lora Aborn (1907–2005)
• Girolamo Abos (1715–1760)
• Paul Abraham (1892–1960)
• Maurice Abrahams (1883–1931)
• Hans Abrahamsen (born 1952)
• Harriett Abrams (1758–1821)
• Alexander Abramsky (1898–1985)
• Kornél Ábrányi (1822–1903)
• Zequinha de Abreu (1880–1935)
• Ayoob Tarish Absi (born 1942)
• Jean Absil (1893–1974)
• Franz Abt (1819–1885)
• Henry Abyngdon (c. 1418–1497)
• Filippo Acciaiuoli (1637–1700)
• Jean-Baptiste Accolay (1833–1900)
• Joseph Achron (1886–1943)
• Dieter Acker (1940–2006)
• Marcial del Adalid (1826–1881)
• Adolphe Adam (1803–1856)
• Bernat Adam Ferrero [ca] (born 1942)
• Mark Adamo (born 1962)
• Alton Augustus Adams, Sr. (1889–1987)
• H. Leslie Adams (born 1932)
• John Adams (born 1947)
• John Luther Adams (born 1953)
• Stephen Adams (Michael Maybrick) (1841–1913)
• Thomas Adams (1785–1858)
• Ella Adayevskaya (Elisabeth Schultz-Adaïewsky) (1846–1926)
• Richard Addinsell (1904–1977)
• John Addison (c. 1765–1844)
• John Addison (1920–1998)
• Thomas Adès (born 1971)
• Vasif Adigezalov (1935–2006)
• Hugo Adler (1894–1955)
• Lawrence Cecil Adler (1914–2001)
• Samuel Adler (born 1928)
• Anton Cajetan Adlgasser (1729–1777)
• Bruce Adolphe (born 1955)
• Olle Adolphson (1934–2004)
• Theodor W. Adorno (1903–1969)
• Emmanuel Adriaenssen (c. 1554–1604)
• John Adson (c. 1587–1640)
• Josina van Aerssen (1733–1797)
• Nikolay Afanas'yev (1820–1898)
• Zeca Afonso (1929–1987)
• Agostino Agazzari (1578–1640)
• Klaus Ager (born 1946)
• Milton Ager (1893–1979)
• François d'Agincourt (1684–1758)
• Maria Teresa Agnesi (1720–1795)
• Lejla Agolli (born 1950)
• Lodovico Agostini (1534–1590)
• Paolo Agostino (c. 1583–1629)
• Johan Agrell (1701–1765)
• Alexander Agricola (c. 1446–1506)
• Johann Friedrich Agricola (1720–1774)
• Martin Agricola (1486–1556)
• Dionisio Aguado (1784–1849)
• Graciela Agudelo (born 1945)
• Ernani Aguiar (born 1950)
• Miguel del Águila (born 1957)
• Sebastian Aguilera de Heredia (1561–1627)
• Eden Ahbez (1908–1995)
• Johann Georg Ahle (1651–1706)
• Johann Rudolph Ahle (1625–1673)
• Countess Maria Theresia Ahlefeldt (1755–1810)
• Jacob Niclas Ahlström (1805–1857)
• Ahn Eak-tai (1906–1965)
• Oscar Ahnfelt (1813–1882)
• Kalevi Aho (born 1949)
• Sieglinde Ahrens (born 1936)
• Gregor Aichinger (c. 1565–1628)
• Bartholomäus Aich (17th century)
• Karl Stefan Aichelburg (1782–1817)
• John Akar (1927–1975)
• Doris Akers (1923–1995)
• Toshiko Akiyoshi (born 1929)
• Necil Kazım Akses (1908–1999)
• Yasushi Akutagawa (1925–1989)
• Jehan Alain (1911–1940)
• Alamanda de Castelnau (fl. second half of 12th century)
• Pierre Alamire (Peter van den Hove) (c. 1470–1536)
• Johannes Alanus (fl. late 14th or early 15th century)
• Jean-Delphin Alard (1815–1888)
• Isaac Albéniz (1860–1909)
• Mateo Pérez de Albéniz (1755–1831)
• Pedro Albéniz y Basanta (1795–1855)
• Pedro Alberch Vila (1517–1582)
• Petur Alberg (1885–1940)
• Eleanor Alberga (born 1949)
• Pirro Albergati (1663–1735)
• Sebastián de Albero [es] (1722–1756)
• Eugen d'Albert (1864–1932)
• Heinrich Albert (1604–1651)
• Stephen Albert (1941–1992)
• Thomas Albert (born 1948)
• Domenico Alberti (c. 1710–1740)
• Gasparo Alberti (c. 1489–c. 1560)
• Giuseppe Matteo Alberti (1685–1751)
• Innocentio Alberti (c. 1535–1615)
• Johann Friedrich Alberti (1642–1710)
• Ignazio Albertini (1644–1685)
• Joachim Albertini (1748–1812)

etc etc