|Centuries:||17th century – 18th century – 19th century|
|Decades:||1670s 1680s 1690s – 1700s – 1710s 1720s 1730s|
|Years:||1700 1701 1702 – 1703 – 1704 1705 1706|
|1703 by topic:|
|Arts and Sciences|
|Archaeology – Architecture – Art – Literature (Poetry) – Music – Science|
|Canada – England – Scotland –|
|Lists of leaders|
|Colonial governors – State leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||2456|
|English Regnal year||1 Ann. 1 – 2 Ann. 1|
|Chinese calendar||壬午年 (Water Horse)
4399 or 4339
— to —
癸未年 (Water Goat)
4400 or 4340
|- Vikram Samvat||1759–1760|
|- Shaka Samvat||1625–1626|
|- Kali Yuga||4804–4805|
|Japanese calendar||Genroku 16
|Julian calendar||Gregorian minus 11 days|
|Minguo calendar||209 before ROC
|Thai solar calendar||2245–2246|
|Wikimedia Commons has media related to 1703.|
Year 1703 (MDCCIII) was a common year starting on Monday (link will display the full calendar) of the Gregorian calendar and a common year starting on Friday of the 11-day slower Julian calendar. In the Swedish calendar it was a common year starting on Thursday, one day ahead of the Julian and ten days behind the Gregorian calendar.
- January 14 – An earthquake hits Norcia, Italy.
- January 30 (December 14 of previous year in the Chinese calendar) – In Japan, the revenge of the Forty-seven Ronin occurs, assassinating Daimyo Kira Yoshinaka, the enemy of their former lord Asano Naganori, at his own mansion as a vengeance. 46 of the 47 samurai commit seppuku, a ritual suicide on March 20 (February 4 in the Chinese calendar).
- February – Soldiers at Fort Louis de la Mobile celebrate Mardi Gras in Mobile, starting the tradition for Mobile, Alabama.
- February 2 – An earthquake hits the town of L'Aquila, Italy.
- April 21 – The Company of Quenching of Fire (i.e., a fire brigade) is founded in Edinburgh, Scotland.
- May 26 – Portugal joins the Grand Alliance.
- May 27 (May 16 OS) – The city of Saint Petersburg is founded in Russia following Peter the Great's reconquest of Ingria from Sweden during the Great Northern War.
- June 15 – Hungarians rebel under Prince Francis II Rákóczi.
- June – The completed Icelandic census of 1703 is presented in the Althing, the first complete census of any country.
- July 29–July 31 – Daniel Defoe is placed in a pillory, then imprisoned for four months for the crime of seditious libel, after publishing his politically satirical pamphlet The Shortest Way with the Dissenters (1702) (his release is granted in mid-November).
- August 23 – Edirne event: Sultan Mustafa II of the Ottoman Empire is dethroned.
- September 12 – War of the Spanish Succession – Habsburg Archduke Charles is proclaimed King of Spain but never exercises full rule.
- October – A whirlwind blows down the tower of the Gan Takal in Gondar, capital of Ethiopia, killing 30.
- November 15 – The Kurucs defeated the Austrians and its allies (from Denmark, Hungary and the Serbs) near Zvolen (present day Slovakia)
- November 19 – The Man in the Iron Mask dies in the Bastille.
- November 24–December 2 – The Great Storm of 1703, an Atlantic hurricane, ravages southern England and the English Channel, killing nearly 8,000, mostly at sea.
- November 30 – Isaac Newton is elected president of the Royal Society in London, a position he will hold until his death in 1727.
- December 27 – Portugal and England sign the Methuen Treaty, which gives preference to Portuguese wines imported into England.
- December 28 – Ahmed III succeeds the deposed Mustafa II as Ottoman Emperor.
- French-born imposter George Psalmanazar arrives in London.
- February 5 – Gilbert Tennent, Irish-born religious leader (d. 1764)
- March 5 (N. S.) – Vasily Trediakovsky, Russian poet (d. 1768)
- May 14 – David Brearly, delegate to the U.S. Constitutional Convention (d. 1785)
- June 26 – Thomas Clap, first president of Yale University (d. 1767)
- June 28 – John Wesley, English founder of Methodism and anti-slavery activist (d. 1791)
- 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 Konščak, Croatian explorer (d. 1759)
- date unknown – Jack Broughton, English bare-knuckle fighter who produced the earliest known rules of boxing (d. 1789)
- 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 (identity unknown)
- 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)