Name
- 100 Club, music venue, 1942-1
- AMM, free improvisation group, 1965-1
- Aaron, Lilia, artist, fl 1973-20112
- Aaron, Richard, American rare book dealer, fl 1973-20111
- Abrams, Stephen Irwin, scholar of parapsychology and a drug policy activist; founder of the Society of Mental Awareness, 1938-20121
- Adams, Richard, Designer and illustrator of underground magazines, fl 1967-19791
- Ambrose, Joe, writer, filmmaker, and arts agitator; founder of Radio Alamut, counterculture zine, fl 19931
- Amirkhanian, Charles, American composer, percussionist, sound poet, and radio producer, b 19451
- Andre, Michael, disc jockey, poet, critic and editor, b 19461
- Anti-Nazi League, 1977-20031
- Apple Records, record label, 1968-1
- Art Monthly, magazine of contemporary art, 1976-1
- Art Workers' Coalition, New York coalition of artists, filmmakers, writers, critics, and museum staff, 1969-19711
- Arts Council of Great Britain, 1946-19941
- Arts Lab, arts centre, 1967-19691
- Asher, Jane, actress, writer and businesswoman, b 19463
- Asher, Margaret, music teacher and musician, mother of Peter and Jane Asher, 1914-20111
- Asher, Peter, guitarist, singer, manager and record producer, of Peter and Gordon, b 19443
- Atlas Press, publishing firm, 1983-1
- Atyeo, Don, author and editor, fl 19931