By Series - Dictionary of World Biography: Twentieth Century
- A. A. Milne
- A. Philip Randolph
- Aaron Copland
- Abba Eban
- Abel Gance
- Abraham Flexner
- Adlai E. Stevenson
- Adolf Hitler
- Adolf von Harnack
- Agatha Christie
- Agnes de Mille
- Agnes Martin
- Ahmad Zaki Yamani
- Ahmed Sékou Touré
- Aileen Clarke Hernandez
- Aimé Césaire
- Akihito
- Akio Morita
- Akira Kurosawa
- Al Capone
- Al Gore
- Alan Greenspan
- Alan Mathison Turing
- Alan Paton
- Alan Shepard
- Alban Berg
- Albert Calmette
- Albert Camus
- Albert Kesselring
- Albert Lutuli
- Albert Schweitzer
- Alberto Giacometti
- Alberto Santos-Dumont
- Alcide De Gasperi
- Aldous Huxley
- Aleksandr Blok
- Aleksandr Fyodorovich Kerensky
- Aleksandr Ivanovich Oparin
- Aleksandr Solzhenitsyn
- Alexander Calder
- Alexander Dubček
- Alexandra Danilova
- Alfred Adler
- Alfred E. Smith
- Alfred Harmsworth and Harold Harmsworth
- Alfred Hitchcock
- Alfred Kinsey
- Alfred North Whitehead
- Alfred Stieglitz
- Alfred von Tirpitz