- Abheiter, Hermann
- Absil, Jean
- Abt, Franz
- Adam, Adolphe
- Adams, Stephen
- Adler, Samuel
- Agostini, Pietro Simone
- Albéniz, Isaac
- Albinoni, Tomaso
- Alfano, Franco
- Alnaes, Eyvind
- Alvarez, Fermin María
- Alveri, Giovanni Battista
- Amadei, Albert
- Amalia, Anna
- Ambrose, Paul
- Amram, David Werner
- Andrews, Mark
- Aniello, Pancrazio
- Anonymous English Composers
- Anonymous French Composers
- Anonymous German Composers
- Anonymous Italian Composers
- Anonymous Spanish Composers
- Ansorge, Conrad
- Araia, Francesco
- Arditi, Luigi
- Argento, Dominick
- Arne, Thomas Augustine
- Arnim, Bettina von
- Arnold, Carl
- Arrieta, Emilio
- Asensi, Juan Miguel
- Asioli, Bonifazio
- Astorga, Emanuele d’
- Attenhofer, Carl
- Attwood, Thomas
- Auber, Daniel
- Aubert, Louis
- Auric, Georges
- Ayres, Frederic
