- Adolphe, Bruce (1955-)
- Adonaï, Joseph Arthur (1891-1965)
- Adrán Cambón, José Manuel (1909-2004)
- Adriaansz, Peter Stewart (1966-)
- Æolian Company
- Æolian Pipe-Organ Co.
- Æolian-Skinner Organ Company
- Æschlimann, Robert Louis (1893-)
- Æthelwold, Saint
- Agabarov, Arcady Artemyvitch (1940-)
- Ågård, Ferdinand Theodor Michael (1860-1945)
- Ågard, Han Thorvald (1877-1937)
- Agate, Ernest William (1880-)
- Agate, William John (1843-1915)
- Agemans, A. (1836-1872)
- Ager, Laurence Mitchell (1904-)
- Ager, Klaus (1946-)
- Agerfelt Oleson, Thomas (1969-)
- Agg, David (1949-)
- Agincour, Jacquet Andre François d’ (1684-1758)
- Agostinho de Cruz (c1590-1633)
- Agostini, Guiseppe (1890-1971)
- Agostini, Mezio (1875-1944)
- Agostini, Paolo (1593-1629)
- Agratina, Georgij (1948-)
- Agrell, Johan Joachim (1701-1765)
- Agricola, George Ludwig (1643-1676)
- Agricola, Johann Friedrich (1720-1774)
- Agricola, Rudolph (1443-1485)
- Agsteribbe, Frank (1968-)
- Agthe, Johann Christoph (1814-1868)
- Agthe, Karl (Carl) Christian (1762-1797)
- Agueras Gonzáles, Francisco (1876-)
- Aguiar, Ari (1958-)
- Aguila, Miguel del (1957-)
- Aguilar, Emanuel Abraham (1824-1904)
- Aguiléra de Herédia, Sebastián (1561-1627)
- Aguilera Gil, Bonifacio (1882-1936)
- Aguilera Gil, Flavio (1890-1963)
- Aguirre, Cirilo de
- Aguirre, Father Domingo de (-1725)
- Agutter, Dr Benjamin (1844-1913)
- Åhgren, Karl Erik
- Ahlberg, Gunnar (1942-)
- Ahlberg, Verner (1896-1967)
- Ahle, Johann Georg (1651-1706)
- Ahle, Johann Rudolph (1625-1673)
- Åhlén, Waldemar (1894-1982)
- Ahlin, Sven Åke (1951-)
- Ahlstrøm, A. J. N. (1762-)
- Ahlstrom, Dr Albert (1957-)
- Ahlstrøm, Ölof (1756-1835)
- Ahlund, Thorild (1928-1995)
- Ahmas, Harri Pentti (1957-)
- Aho, Kalevi Ensio (1949-)
- Ahrens, Joseph Johannes Clemens (1904-1997)
- Ahrens, Sieglinde Maria (1936-)
- Aiache, Paul
- Aiblinger, Johann Caspar (Kasper) (1779-1867)
- Aichinger, Gregor (1564-1628)
- Aickin, Walter Dobbin (1895-)
- Aigmüller, Andreas (1952-)
- Ainley, William Clarke (1834-1910)
- Ainscough, Henry (c1850-)
- Ainscough, Henry (1881-)
- Ainscough, Juliana Mary (1957-)
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- Ainsworth, Birtie Foxton (c1860-)
- Aitken, Dr George Benjamin Johnston (1866-1942)
- Aitken, Hugh (1924-)
- Aizpurúa Zalacaín, Pedro (1924-)
- Ajdinović, Jacek Wiktor (1985-)
- A’kempis, Jean Florent (1635-1711)
- A’kempis, Nicholas
- Åkerberg, Carl Erik Emanuel (1860-1938)
- Åkerberg, Herman (1875-1954)
- Akerberga, Ilze (1953-)
- Akerley, George
- Åkerlund, Mats (1954-)
- Åkerman, Per Larsson (1826-1876)
- Akerman, Richard Frank Martin (1871-c1938)
- Akeroyd, Arthur Thomas (1861-1943)
- Åkerwall, Martin (1965-)
- Akperov, T.
- Akhurst, Robert Barwick (1875-)
- Akutagawa, Yasushi (1925-1989)
- Ala, Giovanni Battista (1580-1612)
- Aladov, Nikolai Illyich (1890-1972)
- Alagna, Jean Pascal (1963-)
- Alain, Albert Paul (1880-1971)
- Alain, Jehan Ariste (1911-1940)
- Alain, Marie Claire (1926-)
- Alain, Marie Odile (1914-1937)
- Alain, Olivier P. (1918-1994)
- Alaleona, Domenico (1881-1928)
- Alary, Auguste
- Alassio, Serafino (1872-1915)
- Alavillamo, Erkki (1943-)
- Albéniz, Pedro (1795-1855)
- Alberch Vila (1517-1582)
- Alberdi Aguirrezábal, Antonio (1893-1986)
- Albergoni, Angelo (1880-1954)
- Albero, Sebastián Ramón de (1722-1756)
- Albert, G. R.
- Albert, Heinrich (1604-1651)
- Albert, Howard
- Albert, H.R.H. Prince (1819-1861)
- Alberti, Johann Friedrich (1642-1710)
- Alberti, Luigi de
- Albertin, Alfons
- Alberto de Gómez, Luis
- Albertsen, Per Hjort (1919-)
- Albes, Karl Friedrich (1930-)
- Albinoni, Tommaso Giovanni (1671-1750)
- Albjerg, Hans Corfitz (-1990)
- Albas, W.
- Albrecht, Alexander (1885-1958)
- Albrecht, Cheryl L. (1944-)
- Albrecht, Christoph (1930-)
- Albrecht, Gustav Adolf (1825-)
- Albrecht, Gustav von (1891-1976)
- Albrecht, Johann Matthäus (1701-1769)
- Albrecht, Mark (1962-)
- Albrecht, Moonycen Brown (1936-)
- Albrecht, Theodor
- Albrecht, Timothy Edward (1950-)
- Albrechtsberger, Johann Georg (1736-1809)
- Albrespic, Jacques (1922-1987)
- Albrici, Bartolomeo
- Albrici, Vincenzo (1631-1696)
- Albright, William Hugh (1944-1998)
- Albuquerque, Armando (1901-1986)
- Albus, Thomas (1964-)
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Organist & composer 
Composer 
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