List of years in science (Table)
… 1781 • 1782 • 1783 • 1784 • 1785 • 1786 • 1787 •    1788 • 1789 • 1790 – 1791 – 1792 • 1793 • 1794 •    1795 • 1796 • 1797 • 1798 • 1799 • 1800 • 1801 …
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… 1788 • 1789 • 1790 – 1791 – 1792 • 1793 • 1794 … … 1760s • 1770s • 1780s – 1790s – 1800s • 1810s • 1820s … … 17th century – 18th century – 19th century …
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The year 1791 in science and technology involved some significant events.

Physics

• Pierre Prévost shows that all bodies radiate heat, no matter how hot or cold they are.

Awards

• Copley Medal: James Rennell; Jean-André Deluc

Births

• April 9 - George Peacock, English mathematician (died 1858)
• April 27 - Samuel F. B. Morse, inventor (died 1872)
• July 13 - Allan Cunningham, English botanist and explorer (died 1839)
• September 22 - Michael Faraday, chemist and physicist (died 1867)
• September 23 - Johann Franz Encke, astronomer (died 1865)
• December 26 - Charles Babbage, English mathematician and inventor of computing machines (died 1871)

Deaths