- Asia, Daniel (1953-)
- Asiaín Bardaxi, Joaquin (1758-1828)
- Askew, Norman (1901-)
- Askham, Roger (1864-1934)
- Asma, Feike (1912-1984)
- Asola, Giovanni Matteo (1524-1609)
- Asper, Frank Wilson (1892-1973)
- Aspinall, William (c1857-)
- Asplöf, Herman (1881-1959)
- Asplund, Christian (1964-)
- Aspull, William (1798-1875)
- Asriel, André (1922-)
- Assandra, Caterina
- Assandri, Giordano (1940-)
- Asseyev, Igor Mikhailovich (1921-)
- Assmayer, Ignaz (1790-1862)
- Astfalk, Thomas J. (1960-)
- Astill, John Stinson (1886-)
- Astley, Beatrice Dorothea (1886-1919)
- Aston, Walter (1867-)
- Astrup, Bendt (1932-)
- Asula, Giovanni Matteo (1524-1609)
- Atehortúa Amaya, Blas Emilio (1933-)
- Athanasiades, Georges (1929-)
- Atherton, Matthew Peter (1967-)
- Atherton, Robert (1910-)
- Athill, Stanley (1915-)
- Athoe, Newman H.
- Atkins, Frederick Pyke (1830-1897)
- Atkins, Sir Ivor Algernon (1869-1953)
- Atkins, Robert Augustus (1811-1889)
- Atkinson, Frederick Cook (1841-1897)
- Atkinson, Geoffrey Eric (1943-)
- Atkinson, George D.
- Atkinson, Herbert Edward (1897-)
- Atkinson, Janet Elizabeth (1896-)
- Atkinson, Rowland Hill (1892-)
- Atkinson, Sarah Phillis (Phyllis) (c1833-1906)
- Atkinson, W. C.
- Atkinson, William Gordon Hewlett (1928-)
- Atney, David M. (1970-)
- Attaingnant, Pierre (1494-1552)
- Atterberg, Kurt Magnus (1887-1974)
- Attersoll, Walter (1863-1936)
- Atterton, Herbert (1879-)
- Atterton, Tom (c1840-c1920)
- Attewell, Thomas Edward Purdue (1864-1949)
- Attinger, Ludwig Conrad (1825-)
- Attride, Tim
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- Attrup, Karl (Carl) August (1848-1892)
- Attwater, John Post (1862-1909)
- Attwood, Frederick William (1869-)
- Attwood, Thomas (1765-1838)
- Atwell, Richard (c1770-)
- Atz, Samuel Gottfried (1759-1837)
- Aubel, Henri Lebeau d’
- Auber, Chantal (1931-)
- Auberlen, Samuel Gottlob (1758-1829)
- Aubert, Gaston Jacques Joseph (1840-1917)
- Aubertin, Valéry (1970-)
- Aubeux, Abbé Louis (1917-1999)
- Aubin, Francine (1938-)
- Aubin, (Tony) Louis Alexandre (1907-1981)
- Aubry, Jean
- Auda, Alain (1942-)
- Audersch, Ludwig (1959-)
- Audersch, Stephan Paul (1961-)
- Audran, Edmond (1842-1901)
- Audsley, George Ashdown (1838-1925)
- Auer, Joseph Albert (1856-1911)
- Aufenanger, Friedhelm (1955-)
- Auffmann, Joseph Anton Xaver (1720-1778)
- Augello, Calogero (1924-2002)
- Auger, F.
- Augustyn, Rafal (1951-)
- Augoulet, S.
- Aulagnier, Antonin (1800-1892)
- Auli, Juan (1797-1869)
- Aulin, Laura Valborg (1860-1928)
- Austen, Bernard
- Austin, Basil G.
- Austin, Donald Basil (1933-2004)
- Austin, Dr Elizabeth R. (1938-)
- Austin, Ernest John (1873-1947)
- Austin, Frederick William (1872-1952)
- Austin, Frederick B.
- Austin, George (1902-)
- Austin, John Turnell (1869-1948)
- Austin, Richard Russell (1943-)
- Austin, William Frank (1846-1891)
- Austin, William W. (1920-2000)
- Austin Organ Co.
- Austin Universal Air Chest Organ Building Co.
- Autenrieth, Ronald J. (1959-)
- Auton, John George (1915-)
- Autran, A. (1928-)
- Auty, Arnold Whitehead (1883-)
- Auzende, Ange Marie (1850-)
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Organist 
Organist & composer 
Composer 
Organ builder 
Other
