George Antheil, (19001959),
Bruno Abakanowicz, (18521900), Poland/Lithuania/Russia/France Integraph, spirograph
Vitaly Abalakov, (19061986), Russia camming devices, Abalakov thread (or V-thread) gearless ice climbing anchor
Hovannes Adamian, (18791932), Armenia/Russia tricolor principle of the color television
Robert Adler, (19132007), Austria/United States wireless remote control (with Eugene Polley)
Anatoly Alexandrov, (19031994), Russia anti-mine demagnetising of ships, naval nuclear reactors (including one for the first nuclear icebreaker)
Alexandre Alexeieff, (19011982) Russia/France pinscreen animation (with his wife Claire Parker)
Rostislav Alexeyev, (19161980), Russia ekranoplan
Zhores Alferov, (1930), Russia heterotransistor, continuous-wave-operating diode laser (together with Dmitri Garbuzov)
Genrich Altshuller, (1926199

, Russia TRIZ ("The Theory of Solving Inventor's Problems")
Hermann Anschόtz-Kaempfe, (18721931), Germany Gyrocompass
Mary Anderson, (18661953), United States windshield wiper blade
Vasily Andreyev, (1861191

, Russia standard balalaika
Oleg Antonov, (19061984), Russia An-series aircraft, including A-40 winged tank and An-124 (the largest serial cargo, later modified to world's largest fixed-wing aircraft An-225)
Nicolas Appert, (17491841), France canning (airtight food preservation)
Archimedes, (c. 287212 BC), Greece Archimedes' screw
Ami Argand, (17501803), France Argand lamp
Edwin Howard Armstrong, (18901954), U.S. FM radio
William George Armstrong, (18101900), UK hydraulic accumulator
Neil Arnott, (17881874), UK waterbed
Lev Artsimovich, (19091973), Russia tokamak
Joseph Aspdin, (17881855), UK Portland cement
John Vincent Atanasoff, (19031995), Bulgaria/U.S. modern digital computer
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