- Aaltonen, Erik (Erkki) Verner (1910-1990)
- Aavik, Juhan (1884-1982)
- Abba, Raymond (1910-)
- Abbey, John (1785-1859)
- Abbey, Margaret Doreen (1905-)
- Abbink Spaink, Pierre François (1931-2001)
- Abbott, Anthony William (1941-)
- Abbott, Arthur (1878-)
- Abbott, Horace (1894-)
- Abbott, Dr Kenneth John Dearle (1919-2002)
- Abbott, Leo (1950-)
- Abbott, Richard Lawrence (Larry) (c1915-1990)
- Abbott, Walter Samuel (1867-)
- Abbott & Smith
- Abdey, Dr Alfred William (1876-1952)
- Abeele, Henri van den
- Abeille, Johann Christian Ludwig (1761-1838)
- Abël, David (-1639)
- Abel, Otto (1905-1977)
- Abela, Don Placidio (1814-1876)
- Abendroth, Fedor Georg Walter (1896-1973)
- Åberg, Jan Håkan (1916-)
- Åberg, Thomas Harald Georg (1952-)
- Abernethy, Dr Frank Nicholson (1864-1927)
- Abley, Henry Thomas (1917-)
- Abraham, Alice Mary (1905-)
- Abrahamsen, Erik Schack Olufsen (1893-1949)
- Abram, Dr John (1840-1918)
- Abrányi, Emil (1882-1970)
- Absil, Jean Nicolas Joseph (1893-1974)
- Abyngdon, Henry (1418-1497)
- Aceves y Lozano, Rafael de (1837-1876)
- Achenbach, Thomas
- Acker, Dieter (1940-)
- Acklam, Winifred Mary (c1879-)
- Ackrill, Mostyn Thomas Harwood (1861-)
- Acosta, Paul d’
- Adam, Adolphe Charles (1803-1856)
- Adam, Arthur Bertie
- Adam, Carl F. (1770-1810)
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- Adam, Friedrich (Fritz) (1904-1984)
- Adam, Johann Georg
- Adam, Johann Ludwig
- Adams, Abraham
- Adams, Abram Elbert (c1912-1995)
- Adams, Edgar (1834-1890)
- Adams, Edwin Adam (1877-)
- Adams, Edwin Crimp (1872-)
- Adams, Eric John (1915-)
- Adams, Frank Stewart (1885-1964)
- Adams, Harrison Leslie (1932-)
- Adams, Jean (1908-)
- Adams, John (1876-)
- Adams, John Henry (1870-)
- Adams, John Luther (1953-)
- Adams, Joseph Henry (1863-)
- Adams, Stephen (1844-1913)
- Adams, Thomas (1785-1858)
- Adams, Thomas (1857-1918)
- Adams, William (1875-)
- Adams, William H. (1820-1914)
- Adamson, John (1886-)
- Adamson, John George (1913-)
- Adam von Fulda (c1445-1505)
- Adcock, Arthur Frederick (c1858-)
- Adderley, Mark (1960-)
- Addinson, John (1889-)
- Addis, Edwin (c1869-)
- Adelung, Jakob (1699-1762)
- Adelung, Wolfgang (-1994)
- Adès, Thomas (1971-)
- Adkins, James Edward
- Adlam, Frank (1858-1929)
- Adler, C.
- Adler, Emmanuel (1845-1926)
- Adler, J.
- Adler, Samuel Hans (1928-)
- Adlgasser, Anton Cajetan (1729-1777)
- Adlung, Jacob (Jakob) (1699-1762)
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Organist 
Organist & composer 
Composer 
Organ builder 
Other
