| Invention | Inventor | Country | Year |
| Radar | Dr A.H. Taylor and L.C. Young | USA | 1922 |
| Radium | Marie and Pierre Curie | France | 1898 |
| Radio | G. Marconi | England | 1901 |
| Rayon | American Viscose Co. | USA | 1910 |
| Refrigerator | J. Harrison and A. Catlin | Britain | 1834 |
| Revolver | Samuel Colt | USA | 1835 |
| Rubber (vulcanized) | Charles Goodyear | USA | 1841 |
| Rubber (waterproof) | Charles Macintosh | Scotland | 1819 |
| Safety lamp | Sir Humphrey Davy | England | 1816 |
| Safety pin | William Hurst | USA | 1849 |
| Sewing machine | Thimmonnier | France | 1830 |
| Scooter | G. Bradshaw | England | 1919 |
| Ship (steam) | J.C Perier | France | 1775 |
| Ship (turbine) | Sir Charles Parsons | Britain | 1894 |
| Shorthand (modem) | Sir Issac Pitman | Britain | 1837 |
| Steam engine (piston) | Thomas Newcome | England | 1712 |
| Steam engine (condenser) | James Watt | Scotland | 1765 |
| Stainless Steel | Harry Brearley | England | 1913 |
| Tank | Sir Ernest Swington | England | 1914 |
| Telegraph code | Samuel F.B. Morse | USA | 1837 |
| Telephone | Alexander Graham Bell | USA | 1876 |
| Telescope | Hans Lippershey | Netherlands | 1608 |
| Television | John Logie Bared | Scotland | 1926 |
| Thermometer | Daniel Gabriel Fahrenheit | Germany | 1714 |
| Tractor | J. Froelich | USA | 1892 |
| Transistor | Bardeen, Shockley | USA & UK | 1949 |
| Typewriter | C. Sholes | USA | 1868 |
| Watch | A.L. Breguet | France | 1719 |
| X-ray | Wilhelm Roentgen | Germany | 1895 |