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1794 (MDCCXCIV) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1794th year of the Common Era (CE) and Anno Domini (AD) designations, the 794th year of the 2nd millennium, the 94th year of the 18th century, and the 5th year of the 1790s decade. As of the start of 1794, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.
- January 13 – The U.S. Congress enacts a law providing for, effective May 1, 1795, a United States flag of 15 stars and 15 stripes, in recognition of the recent admission of Vermont and Kentucky as the 14th and 15th states.  A subsequent act restores the number of stripes to 13, but provides for additional stars upon the admission of each additional state.
- January 21 — King George III delivers the speech opening Parliament and recommends a continuation of Britain's war with France
- February 4 – French Revolution: The French First Republic abolishes slavery.
- February 11 – The first session of the United States Senate is open to the public.
- The Eleventh Amendment to the United States Constitution is passed by Congress for submission to the states for ratification. 
- March 11 – Canonsburg Academy (now Washington & Jefferson College) is chartered by the Pennsylvania General Assembly.
- March 12 – General Antoni Madaliński, a commander of the National Cavalry in the Polish–Lithuanian Commonwealth, disobeys an order from the ruling Russian Empire and Kingdom of Prussia imposing demobilization, advancing his troops from Ostrołęka to Kraków.
- March 14 – Eli Whitney is granted a patent for the cotton gin.
- March 22— Congress prohibits American ships from supplying slaves to any nation other than the United States, setting a penalty of forfeiture of the ship and a $2,000 fine. 
- March 24 – Tadeusz Kościuszko makes his proclamation, starting the Kościuszko Uprising against the Russian Empire and Kingdom of Prussia, in the Polish–Lithuanian Commonwealth and Prussian Partition.
- March 26— The U.S. lays a 60-day embargo on all shipping to and from Great Britain. 
- March 27 –
- January 7 – Eilhard Mitscherlich, German chemist (d. 1863)
- February 11 – Charlotta Eriksson, Swedish actor (d. 1862)
- February 20 – William Carleton, Irish novelist (d. 1869)
- February 21 – Antonio López de Santa Anna, Mexican general and President of Mexico (d. 1876)
- March 5
- April 10 – Matthew Calbraith Perry, American commodore (d. 1858)
- April 11 – Edward Everett, American politician (d. 1865)
- May 17 – Anna Brownell Jameson, British writer (d. 1860)
- May 24 – William Whewell, English scientist, philosopher, and historian of science (d. 1866)
- May 27 – Cornelius Vanderbilt, American entrepreneur (d. 1877)
- June 16 – María Trinidad Sánchez, heroine of the Dominican War of Independence (d. 1846)
- July 5 – Sylvester Graham, American nutritionist, inventor (d. 1851)
- July 7 – Frances Stackhouse Acton, British botanist, archaeologist, writer and artist (d. 1881)
- July 18 – Feargus O'Connor, Irish political radical, Chartist leader (d. 1855)
- July 28 – Charles Longley, Archbishop of Canterbury (d. 1868)
- September 24 – Jeanne Villepreux-Power, French marine biologist (d. 1871)
- November 3 – William Cullen Bryant, American poet (d. 1878)
- November 10 – Robert Towns, merchant, founder of Townsville, Queensland, Australia (d. 1873)
- January 4 – Nicolas Luckner, Marshal of France (executed) (b. 1722)
- January 6 – Louis d'Elbée, French Revolutionary leader (executed) (b. 1752)
- January 8 – Justus Möser, German statesman (b. 1720)
- January 16 – Edward Gibbon, English historian (b. 1737)
- January 28 – Henri de la Rochejaquelein, French Revolutionary leader (b. 1772)
- January 31 – Mariot Arbuthnot, British admiral (b. 1711)
- February 12 – Mahadaji Shinde, Maratha emperor of India (1764–1794)
- March 24 – Jacques Hébert, French Revolutionary leader (executed) (b. 1757)
- March 28 – Marquis de Condorcet, French mathematician, philosopher, and political scientist (died in prison) (b. 1743)
- April 5
- April 13
- April 18 – Charles Pratt, 1st Earl Camden, Lord Chancellor of Great Britain (b. 1714)
- April 23 – Guillaume-Chrétien de Lamoignon de Malesherbes, French statesman (executed) (b. 1721)
- April 27
- May 8 – Antoine Lavoisier, French chemist (executed) (b. 1743)
- May 10 – Élisabeth of France, French princess (executed) (b. 1764)
- June 14 – Francis Seymour-Conway, 1st Marquess of Hertford, Viceroy of Ireland (b. 1718)
- June 17 – Marguerite-Élie Guadet, French Revolutionary leader (executed) (b. 1753)
- June 18
- June 19 – Richard Henry Lee, 12th President of the Continental Congress (b. 1732)
- June 27
- July 13 – James Lind, British pioneer of naval hygiene in the Royal Navy (b. 1716)
- July 17 – John Roebuck, English inventor (b. 1718)
- July 23 – Alexandre de Beauharnais, French politician and general (executed) (b. 1760)
- July 25 – André Chénier, French writer (executed) (b. 1762)
- July 28
- August 6 – Henry Bathurst, 2nd Earl Bathurst, British politician (b. 1714)
- August 14 – Jacoba van den Brande, Dutch culture personality (b. 1735)
- August 17 – Countess Palatine Elisabeth Auguste of Sulzbach, politically active Electress of Bavaria (b. 1721)
- September 1 – Catherine Théot, French visionary (b. 1716)
- September 4 – John Hely-Hutchinson, Irish statesman (b. 1724)
- September 15 – Abraham Clark, American signer of the Declaration of Independence (b. 1725)
- September 16 – Hester Bateman, English silversmith (bap. 1708)
- September 25 – Paul Rabaut, French Huguenot pastor (b. 1718)
- October 21 – Francis Light, founder of the British colony of Penang (b. 1740)
- November 3 – François-Joachim de Pierre de Bernis, French cardinal, statesman (b. 1715)
- November 15 – John Witherspoon, American signer of the Declaration of Independence (b. 1723)
- November 16 – Jean-Baptiste Carrier, French Revolutionary leader (executed) (b. 1756)
- November 22 – John Alsop, American Continental Congressman (b. 1724)
- November 28
- December 12 – Meshullam Feivush Heller, Austrian Hasidic author (b. c. 1742)
In the graphic adventure game Day of the Tentacle, the character Hoagie is sent "200 years in the past" from 1994. He arrives in Revolutionary America during the writing of the Constitution of the United States.
- ^ "Flag of the United States", in The Port Folio (July, 1818) p18
- ^ a b c d e f Harper's Encyclopaedia of United States History from 458 A. D. to 1909, ed. by Benson John Lossing and, Woodrow Wilson (Harper & Brothers, 1910) p170
- ^ Coleman, Helen Turnbull Waite (1956). Banners in the Wilderness: The Early Years of Washington and Jefferson College. University of Pittsburgh Press. p. 204. OCLC 2191890.
- ^ William Hogeland, The Whiskey Rebellion: George Washington, Alexander Hamilton, and the Frontier Rebels Who Challenged America's Newfound Sovereignty" (Simon and Schuster, 2015) p213
- ^ McClelland, W. C. (1903). "A History of Literary Societies at Washington & Jefferson College". The Centennial Celebration of the Chartering of Jefferson College in 1802. Philadelphia: George H. Buchanan and Company. pp. 111–132.
- ^ Weinberg, Bennett Alan; Bealer, Bonnie K. (2001). The world of caffeine: the science and culture of the world's most popular drug. Psychology Press. pp. 92–3. ISBN 978-0-415-92722-2. Retrieved 2015-05-12.