| No. | Scientist's/Inventor's Name | Inventions | Country | Period |
|---|
| 1 | Albert Einstein | Refrigerator | Germany | (1879-1955) |
| 2 | Vitaly Abalakov | Camming devices, Abalakov thread (or V-thread) gearless ice climbing anchor | Russia | (1906-1986) |
| 3 | Ernst Karl Abbe | Condenser (microscope), apochromatic lens, refractometer | Germany | (1840-1905) |
| 4 | Carl Roman Abt | About rack railway system | Switzerland | (1850-1933) |
| 5 | Hovannes Adamian | tricolor principle of the color television | Armenia/Russia | (1879-1932) |
| 6 | William Addis | Toothbrush | England | (1734-1808) |
| 7 | Robert Adler (with Eugene Polley) | wireless remote control | Austria/United States | (1913-2007) |
| 8 | Samuel W. Alderson | Crash test dummy | USA | (1914-2005) |
| 9 | Anatoly Alexandrov | anti-mine demagnetising of ships, naval nuclear reactors | Russia | (1903-1994) |
| 10 | Alexandre Alexeieff (with his wife Claire Parker) | pinscreen animation | Russia/France | (1901-1982) |