Year 1703 (MDCCIII) was a common year starting on Monday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Thursday of the 11-day slower Julian calendar). 1703 of the Swedish calendar was a common year starting on Wednesday, one day ahead of the Julian calendar.
Events of 1703
January - June
July - December
- July 29-31 - Daniel Defoe is placed in a pillory, then imprisoned 4 months for the crime of seditious libel, after publishing a politically satirical pamphlet (his release is granted in mid-November).
- September 12 - War of the Spanish Succession - Habsburg Archduke Charles is proclaimed King of Spain.
- October - A whirlwind blows down the tower of the Gan Takal in Gondar, capital of Ethiopia, killing 30.
- November 19 - The The Man in the Iron Mask dies in the Bastille.
- November 24 to December 2 - The Great Storm of 1703, an Atlantic hurricane, ravages southern England and the English Channel, killing nearly 8,000, mostly at sea.
- December 27 - Portugal and England sign the Methuen Treaty, which gives preference to Portuguese wines imported into England.
- February 5 - Gilbert Tennent, Irish-born religious leader (d. 1764)
- March 5 (N. S.) - Vasily Kirillovich Trediakovsky, Russian poet (d. 1768)
- May 14 - David Brearly, delegate to the U.S. Constitutional Convention (d. 1785)
- June 17 - John Wesley, English founder of Methodism (d. 1791)
- June 26 - Thomas Clap, first president of Yale University (d. 1767)
- August 2 - Lorenzo Ricci, Italian Jesuit leader (d. 1775)
- September 29 - François Boucher, French painter (d. 1770)
- October 5 - Jonathan Edwards, American preacher (d. 1758)
- October 28 - Antoine Deparcieux, French mathematician (d. 1768)
- November 25 - Jean-François Séguier, French astronomer and botanist (d. 1784)
- November 26 - Theophilus Cibber, English actor and writer (d. 1758)
- December 2 - Ferdinand Konšcak, Croatian explorer (d. 1759)
- date unknown - Jack Broughton, English bare-knuckle fighter who produced the earliest known rules of boxing (d. 1789)
See also .
- January 11 - Johann Georg Graevius, German classical scholar and critic (b. 1632)
- March 3 - Robert Hooke, English scientist (b. 1635)
- March 31 - Johann Christoph Bach, German composer (b. 1642)
- April 20 - Lancelot Addison, English royal chaplain (b. 1632)
- May 16 - Charles Perrault, French author (b. 1628)
- May 26 - Samuel Pepys, English civil servant and diarist (b. 1633)
- June 14 - Jean Herauld Gourville, French adventurer (b. 1625)
- July 17 - Roemer Vlacq I, Dutch naval captain (b. 1637)
- September 22 - Vincenzo Viviani, Italian mathematician and scientist (b. 1622)
- September 25 - Archibald Campbell, 1st Duke of Argyll, Scottish privy councillor (b. 1658)
- September 29 - Charles de Saint-Évremond, French soldier (b. 1610)
- October 28 - John Wallis, English mathematician (b. 1616)
- November 19 - The Man in the Iron Mask
- November 30 - Nicolas de Grigny, French organist and composer (b. 1672)
- December 28 - Mustafa II, Ottoman Sultan (b. 1664)
- date unknown - Phetracha, king of Ayutthaya (b. 1632)
See also .