1. John Hadley, (1682–1744), UK – Octant
2. Waldemar Haffkine, (1860–1930), Russia/Switzerland – first anti-cholera and anti-plague vaccines
3. Tracy Hall, (1919–2008 ), U.S. – synthetic diamond
4. John Hays Hammond, Jr., (1888–1965), U.S. – radio control
5. James Hargreaves, (1720–1778), UK – spinning jenny
6. John Harington, (1561–1612), UK – the flush toilet
7. John Harrison, (1693–1776), UK – marine chronometer
8. Victor Hasselblad, (1906–1978), Sweden – invented the 6 x 6 cm single-lens reflex camera(data by facebook/cnaonweb
9. Ibn al-Haytham (Alhazen), (965–1039), Iraq – camera obscura, pinhole camera, magnifying glass
10. George H. Heilmeier, (1936–), U.S. – liquid crystal display (LCD) (data by facebook/cnaonweb
11. Robert A. Heinlein, (1907–1988), U.S. – waterbed
12. Jozef Karol Hell, (1713–1789), Slovakia – the water pillar
13. Rudolf Hell, (1901–2002), Germany – the Hellschreiber
14. Joseph Henry, (1797–1878), Scotland/U.S. – electromagnetic relay(data by facebook/cnaonweb
15. Heron, (c. 10–70), Roman Egypt – usually credited with invention of the aeolipile, although it may have been described a century earlier(data by facebook/cnaonweb
16. John Herschel, (1792–1871), UK – photographic fixer (hypo), actinometer
17. William Herschel, (1738–1822), UK – infrared
18. Heinrich Hertz, (1857–1894), Germany – radio telegraphy, electromagnetic radiation(data by facebook/cnaonweb
19. George de Hevesy, (1885–1966), Hungary – radioactive tracer
20. Rowland Hill, (1795–1879), UK – postage stamp
21. Maurice Hilleman, (1919–2005) – vaccines against childhood diseases
22. Ted Hoff, (1937–), U.S. – microprocessor
23. Felix Hoffmann (Bayer), (1868–1949), Germany – Aspirin
24. Albert Hofmann, (1906–2008), Switzerland – LSD
25. Herman Hollerith, (1860–1929), U.S. – recording data on a machine readable medium, tabulator, punched cards
26. Nick Holonyak, (1928–), U.S. – LED (Light Emitting Diode)
27. Robert Hooke, (1635–1703), UK – balance wheel, iris diaphragm, acoustic telephone
28. Erna Schneider Hoover, (1926–), U.S. – computerized telephone switching system
29. Frank Hornby, (1863–1936), UK – invented Meccano
30. Coenraad Johannes van Houten, (1801–1887), Netherlands – cocoa powder, cacao butter, chocolate milk
31. Elias Howe, (1819–1867), U.S. – sewing machine
32. Muhammad Husayn, (fl.17th century), Persia/Iran – cartographic Qibla indicator with sundial and compass
33. Christiaan Huygens, (1629–1695), Netherlands – pendulum clock
2. Waldemar Haffkine, (1860–1930), Russia/Switzerland – first anti-cholera and anti-plague vaccines
3. Tracy Hall, (1919–2008 ), U.S. – synthetic diamond
4. John Hays Hammond, Jr., (1888–1965), U.S. – radio control
5. James Hargreaves, (1720–1778), UK – spinning jenny
6. John Harington, (1561–1612), UK – the flush toilet
7. John Harrison, (1693–1776), UK – marine chronometer
8. Victor Hasselblad, (1906–1978), Sweden – invented the 6 x 6 cm single-lens reflex camera(data by facebook/cnaonweb
9. Ibn al-Haytham (Alhazen), (965–1039), Iraq – camera obscura, pinhole camera, magnifying glass
10. George H. Heilmeier, (1936–), U.S. – liquid crystal display (LCD) (data by facebook/cnaonweb
11. Robert A. Heinlein, (1907–1988), U.S. – waterbed
12. Jozef Karol Hell, (1713–1789), Slovakia – the water pillar
13. Rudolf Hell, (1901–2002), Germany – the Hellschreiber
14. Joseph Henry, (1797–1878), Scotland/U.S. – electromagnetic relay(data by facebook/cnaonweb
15. Heron, (c. 10–70), Roman Egypt – usually credited with invention of the aeolipile, although it may have been described a century earlier(data by facebook/cnaonweb
16. John Herschel, (1792–1871), UK – photographic fixer (hypo), actinometer
17. William Herschel, (1738–1822), UK – infrared
18. Heinrich Hertz, (1857–1894), Germany – radio telegraphy, electromagnetic radiation(data by facebook/cnaonweb
19. George de Hevesy, (1885–1966), Hungary – radioactive tracer
20. Rowland Hill, (1795–1879), UK – postage stamp
21. Maurice Hilleman, (1919–2005) – vaccines against childhood diseases
22. Ted Hoff, (1937–), U.S. – microprocessor
23. Felix Hoffmann (Bayer), (1868–1949), Germany – Aspirin
24. Albert Hofmann, (1906–2008), Switzerland – LSD
25. Herman Hollerith, (1860–1929), U.S. – recording data on a machine readable medium, tabulator, punched cards
26. Nick Holonyak, (1928–), U.S. – LED (Light Emitting Diode)
27. Robert Hooke, (1635–1703), UK – balance wheel, iris diaphragm, acoustic telephone
28. Erna Schneider Hoover, (1926–), U.S. – computerized telephone switching system
29. Frank Hornby, (1863–1936), UK – invented Meccano
30. Coenraad Johannes van Houten, (1801–1887), Netherlands – cocoa powder, cacao butter, chocolate milk
31. Elias Howe, (1819–1867), U.S. – sewing machine
32. Muhammad Husayn, (fl.17th century), Persia/Iran – cartographic Qibla indicator with sundial and compass
33. Christiaan Huygens, (1629–1695), Netherlands – pendulum clock
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