Avog
- Balt
- Avogadro
- Avogadro , Lorenzo Romano Amedeo Carlo
- Avogadro's
- Axelrod
- Axelrod , Julius
- Ayala , Francisco José
- Baade , Wilhelm Heinrich Walter
- Babbage
- Babbage , Charles
- Babcock , Harold Delos
- Babcock , Horace Welcome
- Babcock , Stephen Moulton
- Babcock, Horace Welcome
- Babinet , Jacques
- Backus , John
- Baekeland
- Baekeland , Leo Hendrik
- Baer , Karl Ernst von
- Baeyer
- Baeyer , Johann Friedrich Adolph von
- Bahcall
- Bahcall , John Noris
- Baird , John Logie
- Bakker , Robert
- Balard , Antoine-Jérôme
- Balfour , Francis Maitland
- Balmer , Johann Jakob