- Abraini, Giorgio
- Abrassart, Jean Michel
- Adair, David
- Adamski, George
- Agobard
- Agrest, Matest
- Agrest, Mikhail
- Aho, Wayne
- Aicha
- Ailleris, Philippe
- Alarcon, Denis
- Aldrich, Jan
- Aldrin, Buzz
- Alessandri, Robert
- Alexander, John B.
- Alexander, Stewart
- Alexis, Gaston
- Allen, Carl Meredith 🤥
- Allen, Carlos M. 🤥
- Allende, Carlos Miguel 🤥
- Almeida, Fernando FM
- Altov, Genrikh
- Altschuler, Martin D.
- Altshuler, John Henry
- Alvarez, Luis W.
- Anderson, Gerald 🤥
- Anderson, Walter S.
- Andreasson, Betty
- Andree, Salomon August
- Andrews, Colin
- Andrews, George C.
- Andrus, Walter H.
- Angelucci, Orfeo
- Archimede
- Aristote
- Armstrong, Neil A.
- Arnold, John E.
- Arnold, Kenneth E.
- Asseline, Michel
- Aubeck, Chris
- Aubeck, Christopher
- Ayer, Frederick II
- Azahehdel, Henry
- Genrich Altshuller