- A
- Abegg ‹àabek›, Richard (propr. Richard Wilhelm Heinrich)
- Abel ‹èibël›, Sir Frederick Augustus
- Abel, Emil
- Abney ‹ä´bni›, Sir William De Wiveleslie
- Achard ‹àkℎart›, Franz Karl
- Acheson, Edward Goodrich
- Acree ‹ekrìi›, Solomon Farley
- Adam ‹ä´dëm›, Neil Kensington
- Adams, Roger
- Adet ‹adè›, Pierre-Auguste
- Adkins ‹ä´dkinʃ›, Homer Burton
- Afzelius, Johan (detto Arvidson)
- Agre ‹ä´gr›, Peter
- Ahrens ‹àarëns›, Felix
- Alder ‹àldër›, Kurt
- Alekseevskij ‹al'iksi̯èfsk'i›, Evgenij
- Alexander, Jerome
- Alimarin ‹al'imàr'in›, Ivan Pavlovič
- Allen, Edwin West
- Alphen ‹àlfë›, Jan van
- Alsberg ‹ä´lsbëëġ›, Carl Lucas
- Alter ‹òoltë›, David
- Alterthum ‹àltërtuum›, Hans
- Altman, Sidney
- Anderson ‹àndërsoon›, Rudolph John
- Anderson, Thomas
- Andrews, Donald Hatch
- Andrews, Thomas
- Anfinsen ‹ä´n-›, Christian Boehmer
- Angelescu ‹-ès-›, Eugen
- Anschütz, Ludwig
- Anschütz, Richard
- Aragóna, Giovanni
- Arbuzov ‹arbùʃëf›, Aleksandr Erminingel´dovič
- Arbuzov, Boris Aleksandrovič
- Arcet ‹arsè› (o Darset), Jean d'
- Arfwedson ‹àrvetsoon›, Johan August
- Arkel ‹àrkël›, Anton Eduard van
- Armstrong, Henry Edward
- Arndt ‹arnt›, Ernst Kurt Ludwig
- Arrhenius, Svante August
- Asimov ‹èiʃimëf›, Isaac
- Astarita, Giovanni
- Aston ‹ä´stën›, Francis William
- Auer ‹àuër›, Karl, barone von Welsbach
- Auwers, Karl
- Avogadro di Quaregna, Amedeo
- Àngeli, Angelo
- Åkerlöf ‹óokėrlööv›, Gösta Carl
- B
- Babcock, Stephen Moulton
- Babo, Lambert Heinrich Clemens von
- Bach ‹bakℎ›, Aleksej Nikolaevič
- Bachmann, Wilhelm
- Baekeland ‹bàakëlant›, Leo Hendrik
- Baeyer ‹bàiër›, Adolf von
- Bain, Edgar Collins
- Baker, Wilson
- Bakunin ‹bakùn'in›, Marussia (o Maria)
- Balandin ‹balànd'in›, Aleksej Aleksandrovič
- Balard ‹balàar›, Antoine-Jérôme