Johan August Arfwedson
İsveçli kimyacı (Skagerholm – Bruk 1792 -Hedensö 1841). Saksonya lepidolitinden litin elde etti. Lityumu yalıttı (1817).
Bilim Adamları
- A. Laurent
- Abdulgafur Acatay
- Abidin Budak
- Adelbert von Chamisso
- Adolf von Baeyer
- Ahmet Mete Işıkara
- Akio Morita (1921 - 1999)
- Albert Einstein
- Albert Einstein
- Albright, William Foxwell
- Alessandro Volta
- Alessandro Volta
- Alexander Graham Bell
- Alexander von Humboldt
- Alexis Bouvard (Fransa, 1767 – 1843)
- Alfred Bernhard Nobel
- Alfred Kastler
- Alfred Lothar Wegener
- Alfred Russel Wallace
- Alfred Stock
- Ali Javan
- Amedeo Avogadro
- Amedeo Avogadro
- Anders Celsius, (1701 – 1744)
- Anders Jonas Ångström (İsveç, 1814 – 1874)
- Andre Marie Ampere
- Annie Jump Cannon (ABD, 1863 – 1941)
- Antoine Lavoisier
- Antonio Abetti (İtalya, 1846 – 1928)
- Antonio Anastasio Volta