1777 (MDCCLXXVII) was a common year starting on Wednesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1777th year of the Common Era (CE) and Anno Domini (AD) designations, the 777th year of the 2nd millennium, the 77th year of the 18th century, and the 8th year of the 1770s decade. As of the start of 1777, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.
|Ab urbe condita||2530|
|Balinese saka calendar||1698–1699|
|British Regnal year||17 Geo. 3 – 18 Geo. 3|
|Chinese calendar||丙申年 (Fire Monkey)|
4473 or 4413
— to —
丁酉年 (Fire Rooster)
4474 or 4414
|- Vikram Samvat||1833–1834|
|- Shaka Samvat||1698–1699|
|- Kali Yuga||4877–4878|
|Japanese calendar||An'ei 6|
|Julian calendar||Gregorian minus 11 days|
|Minguo calendar||135 before ROC|
|Thai solar calendar||2319–2320|
1903 or 1522 or 750
— to —
1904 or 1523 or 751
- January 2 – American Revolutionary War – Battle of the Assunpink Creek: American general George Washington's army repulses a British attack by Lieutenant General Charles Cornwallis, in a second battle at Trenton, New Jersey.
- January 3 – American Revolutionary War – Battle of Princeton: American general George Washington's army defeats British troops.
- January 13 – Mission Santa Clara de Asís is founded in what becomes Santa Clara, California.
- January 15 – Vermont declares its independence from New York, becoming the Vermont Republic, an independent country, a status it retains until it joins the United States as the 14th state in 1791.
- January 21 – The Continental Congress approves a resolution "that an unauthentic copy, with names of the signers of the Declaration of independence, be sent to each of the United States.
- February 5 – Under the 1st Constitution of Georgia, 8 counties are chartered: Burke, Camden, Chatham, Effingham, Glynn, Liberty, Richmond, and Wilkes. This dissolves the existing parishes of St. George, St. Mary's, St. Thomas, St. Phillip, Christ Church, St. David, St. Matthews, St. Andrew, St. James, St. Johns, and St. Paul.
- February 24 – King Joseph I of Portugal dies, and is succeeded by his daughter Maria I of Portugal, and his brother and son-in-law Peter III of Portugal.
- March 4 – The Fourth Continental Congress, with John Hancock as President, who is also known by, begins a 199 day session in Philadelphia, lasting until September 18.
- March 29–30 – Third voyage of James Cook: English explorer Captain Cook discovers Mangaia and Atiu in the Cook Islands.
- April 1 – Friedrich Maximilian Klinger's play Sturm und Drang is premiered by the Seyler Theatre Company in Leipzig, giving its name to the whole Sturm und Drang movement in German literature.
- April 13 – American Revolutionary War – Battle of Bound Brook: A British and Hessian force led by Charles Cornwallis surprises a Continental Army outpost in New Jersey, commanded by Major General Benjamin Lincoln.
- April 27 – American Revolutionary War – Battle of Ridgefield: The British Army defeats Patriot militias, galvanizing resistance in the Connecticut Colony.
- May 8 – Richard Brinsley Sheridan's comedy of manners, The School for Scandal, is first performed at the Theatre Royal, Drury Lane in London.
- May 16 – Lachlan McIntosh and Button Gwinnett shoot each other during a duel near Savannah, Georgia. Gwinnett, a signer of the United States Declaration of Independence, dies three days later.
- June 13 – American Revolution: The Marquis de Lafayette lands near Georgetown, South Carolina, to help the Continental Congress train its army.
- June 14 – The Stars and Stripes is adopted by the Continental Congress as the flag of the United States.
- June 21 – Encyclopædia Britannica Second Edition begins publication in Edinburgh.
- July 6 – American Revolutionary War – Siege of Fort Ticonderoga: After a bombardment by British artillery under General John Burgoyne, American forces retreat from Fort Ticonderoga, New York.
- July 7 – American Revolutionary War – Battle of Hubbardton: British forces capture over 200 of the American rearguard, from Fort Ticonderoga.
- July 8 – The 1777 Constitution of Vermont is signed, officially abolishing slavery.
- August 6 – American Revolutionary War – Battle of Oriskany: Loyalists gain a tactical victory over Patriots; Iroquois fight on both sides.
- August 16 – American Revolutionary War – Battle of Bennington: British and Brunswicker forces are decisively defeated by American troops at Walloomsac, New York.
- August 22 – American Revolutionary War – The Siege of Fort Stanwix is ended by withdrawal of British forces, following a ruse by Benedict Arnold to persuade them that a much larger force is arriving.
- September 3 – American Revolutionary War – Battle of Cooch's Bridge: British and Hessian forces defeat an American militia in a minor skirmish in New Castle County, Delaware.
- September 11 – American Revolutionary War – Battle of Brandywine: The British gain a major victory in Chester County, Pennsylvania.
- September 19 – American Revolutionary War – First Battle of Saratoga (Battle of Freeman's Farm): Patriot forces withstand a British attack at Saratoga, New York.
- September 26 – American Revolutionary War – British troops occupy Philadelphia; members of the Continental Congress flee to Lancaster, Pennsylvania where they meet and hold a one day session as the Fifth Congress before fleeing again.
- September 30 – American Revolutionary War – The Sixth Continental Congress opens its session at York, Pennsylvania, and continues for 272 days until June 27, 1778.
- October 4 – American Revolutionary War – Battle of Germantown: Troops under George Washington are repelled by British troops under Sir William Howe.
- October 6 – American Revolutionary War – Battle of Forts Clinton and Montgomery: British troops capture Fort Clinton and Fort Montgomery (Hudson River), and are able to dismantle the Hudson River Chain.
- October 7 – American Revolutionary War – Second Battle of Saratoga (Battle of Bemis Heights): British General John Burgoyne is defeated by American troops.
- October 17 – American Revolutionary War – Battle of Saratoga: British General John Burgoyne surrenders to the American troops.
- November 15 – American Revolution: After 16 months of debate, the Continental Congress approves the Articles of Confederation, in the temporary American capital at York, Pennsylvania.
- November 17 – American Revolution: The Articles of Confederation are submitted to the states for ratification.
- November 29 – San Jose, California is founded. It is the first pueblo in Spanish Alta California.
- December 18 – The United States celebrates its first Thanksgiving, marking October's victory by the American rebels over British General John Burgoyne at Saratoga.
- December 19 – American Revolutionary War – George Washington's Continental Army goes into winter quarters at Valley Forge, Pennsylvania.
- December 24 – Third voyage of James Cook: English explorer Captain Cook locates Kiritimati (Christmas Island).
- December 30 – Maximilian III Joseph, Elector of Bavaria dies and is succeeded by his distant cousin Charles Theodore, Elector of Bavaria.
- The code duello is adopted at the Clonmel Summer Assizes as the form for pistol duels by gentlemen in Ireland. It is quickly denounced, but nevertheless widely adopted throughout the English-speaking world.
- Kunsthochschule Kassel is founded in Germany as a fine arts academy.
- Det Dramatiske Selskab is founded in Copenhagen (Denmark) as an acting academy.
- George II Frederic is crowned as king of the Miskito Kingdom.
- January – William Barton, English cricketer (d. 1825)
- January 2 – Christian Daniel Rauch, German sculptor (d. 1857)
- January 7 – Lorenzo Bartolini, Italian sculptor (d. 1850)
- January 11 – Vincenzo Borg, Maltese merchant, rebel leader (d. 1837)
- January 13 – Elisa Bonaparte, Grand Duchess of Tuscany, sister of Napoleon Bonaparte (d. 1820)
- January 25 – Karoline Jagemann, German actor (d.1848)
- February 3 – John Cheyne, British physician, surgeon and author (d. 1836)
- February 10 – Amable Berthelot, Quebec lawyer, author and political figure (d. 1847)
- February 12
- February 18 – Andreas Arntzen, Norwegian politician (d. 1837)
- February 20 – Zacheus Burnham, Canadian farmer, judge and public figure (d. 1857)
- February 26 – Matija Nenadović, Prime Minister of Serbia (d. 1854)
- March 3 – Adolphe Dureau de la Malle, French geographer, naturalist, historian and artist (d. 1857)
- March 10 – Robert Allison (Pennsylvania politician), U.S. Representative (d. 1840)
- March 13 – Charles Lot Church, Nova Scotia politician (d. 1864)
- March 17
- March 19 – José María Bustamante, Mexican composer (d. 1861)
- March 28 – Antoine Germain Labarraque, French chemist (d. 1850)
- April 11 – William Addams, United States Congressman (d. 1858)
- April 12 – Henry Clay, American politician (d. 1852)
- April 16 – John Alexander (Ohio politician), U.S. Representative (d. 1848)
- April 30 – Carl Friedrich Gauss, German mathematician, astronomer and physicist (d. 1855)
- May 4 – Richard Bourke, Australian governor (d. 1855)
- May 8 – Mateli Magdalena Kuivalatar, Finnish-Karelian folksinger (d. 1846)
- May 11 – Samuel Bridger, English cricketer
- May 12 – Mary Reibey, Australian businessperson (d. 1855)
- May 18 – John George Children, British chemist, mineralogist and zoologist (d. 1852)
- June 1 – Fernando Errázuriz Aldunate, president of Chile (d. 1841)
- June 12 – Robert Clark, American politician (d. 1837)
- June 14 – Heman Allen (of Milton), U.S. Representative (d. 1844)
- June 15 – David Daniel Davis, British physician (d. 1841)
- June 22
- June 23 – Frederick Bates, American politician (d. 1825)
- July – Thomas Clayton, American lawyer, politician (d. 1854)
- July 9
- July 23 – Philipp Otto Runge, German painter (d. 1810)
- July 26 – Robert Hamilton Bishop, Scottish-American educator, minister (d. 1855)
- July 27
- July 31 – Pedro Ignacio de Castro Barros, Argentine statesman, priest (d. 1849)
- August 11 – Giuseppe Bossi, Italian painter (d. 1815)
- August 12 – George Wolf, American politician (d. 1840)
- August 14 – Hans Christian Ørsted, Danish physicist and chemist (d. 1851)
- August 23 – Princess Adélaïde of Orléans, French princess (d. 1847)
- August 29 – Nikita Bichurin (Hyacinth), Russian monk (d. 1853)
- August 31 – Alexander Bashilov, Russian general (d. 1847)
- September 9 – James Carr (Massachusetts politician), U.S. Congressman (d. 1818)
- September 12 – Henri Marie Ducrotay de Blainville, French zoologist, anatomist (d. 1850)
- September 25 – Joseph Badeaux, Canadian politician (d. 1835)
- October 1 – Zaro Aga, Turkish-Kurdish possible supercentenarian (claimed to have been born this year or 1774; d. 1934)
- October 5 – Guillaume Dupuytren, French anatomist, military surgeon (d. 1835)
- October 16
- October 18
- November 7 – Richard Bassett (clergyman), Welsh cleric (d. 1852)
- November 13 – Kunwar Singh, Leader during the Indian Rebellion of 1857 (d. 1858)
- November 14 – Nathaniel Claiborne, American politician (d. 1859)
- November 24 – Samuel Butts, American militia officer (d. 1814)
- December 1 – Thomas Bradford, British Army officer (d. 1853)
- December 4 – Juliette Récamier, French writer (d. 1849)
- December 10 – William Conner, American trader, politician (d. 1855)
- December 14 – Du Pré Alexander, 2nd Earl of Caledon, Irish peer, landlord and colonial administrator (d. 1839)
- December 15 – Agostino Aglio, Italian painter, decorator and engraver (d. 1857)
- December 16 – Madame Clicquot Ponsardin, French champagne producer (d. 1866)
- December 21 – John Campbell, 7th Duke of Argyll, Scottish peer, Whig politician (d. 1847)
- December 23 – Emperor Alexander I of Russia, Russian officer (d. 1825)
- December 24 – Barbara Spooner Wilberforce, wife of English abolitionist William Wilberforce (d. 1847)
- Suleiman al-Halabi, Syrian student, assassin (d. 1800)
- Carlos Anaya, Uruguayan politician (d. 1862)
- Charles James Apperley, English sportsman, sporting writer (d. 1843)
- Carlo Armellini, Italian politician, activist and jurist (d. 1863)
- Mevlana Halid-i Bagdadi, Ottoman mystic (d. 1826)
- Connell James Baldwin, Irish soldier, civil servant (d. 1861)
- Karl Friedrich Becker, German educator, historian (d. 1806)
- Vicente Benavides, Chilean soldier (d. 1822)
- John Bennett (Hampshire cricketer) (d. 1857)
- William Bellinger Bulloch, U.S. Senator (d. 1852)
- Sophia Campbell, Australian artist (d. 1833)
- Abiel Chandler, U.S. philanthropist (d. 1851)
- John Claiborne, U.S. politician (d. 1808)
- Charles Othon Frédéric Jean-Baptiste de Clarac, French artist, scholar and archaeologist (d. 1847)
- Thomas Cochran (judge), Canadian judge (d. 1804)
- Anselmo de la Cruz, Chilean political figure (d. 1833)
- Thomas Day, American judge (d. 1855)
- Benjamin D'Urban, British general, colonial administrator (d. 1849)
- Tu'i Malila, Malagasy-born tortoise, longest living animal on record (d. 1965)
- January 10 – Spranger Barry, Irish actor (b. 1719)
- January 12 – Hugh Mercer, American Revolutionary War officer, mortally wounded in battle (b. 1726)
- January 13 – James Rait, Anglican clergyman, Scottish Episcopal Church Bishop of Brechin 1742–1777 (b. 1689)
- January 27 – Hubert de Brienne, French naval commander (b. 1690)
- January 30 – Enrichetta d'Este, Duchess of Parma (b. 1702)
- February 9
- February 11 – Sir Gilbert Elliot, 3rd Baronet, of Minto, Scottish statesman, philosopher and poet (b. 1722)
- February 24 – King Joseph I of Portugal (b. 1714)
- February 28 – Joab Hoisington, American major (b. 1736)
- March 1
- March 2 – Empress Xiaoshengxian, mother of the Chinese Qianlong Emperor of China (b. 1692)
- March 4 – Pierre-Herman Dosquet, 4th bishop of Quebec (b. 1691)
- March 6 – Jeremias Friedrich Reuß, German theologian (b. 1700)
- March 10 – John the Painter, British criminal (b. 1752)
- March 20 – Jean-François-Joseph de Rochechouart, French Roman Catholic Cardinal (b. 1708)
- March 23 – Sir Hugh Paterson, 2nd Baronet, Scottish Jacobite and Member of the Parliament of Great Britain (b. 1685)
- March 31 – Richard Terrick, Church of England clergyman, Bishop of Peterborough 1757–1764 and Bishop of London 1764–1777 (b. 1710)
- April 7 – Anna Chamber, British noblewoman and poet (b. 1709)
- April 29 – Antonio Joli, Italian painter of vedute and capricci (b. 1700)
- May 5 – Raphael Hayyim Isaac Carregal, Palestinian rabbi preaching in the Americas (b. 1733)
- May 7 – Jean-Baptiste Nicolas Roch de Ramezay, marine captain and colonial administrator in New France (b. 1708)
- May 9 – Heneage Finch, 3rd Earl of Aylesford, Member of the Parliament of Great Britain (b. 1715)
- May 11 – George Pigot, 1st Baron Pigot, British governor of Madras (b. 1719)
- May 19 – Button Gwinnett, a signatory of the American Declaration of Independence (b. 1735)
- May 22 – David Wooster, American general in the French and Indian War and in the American Revolutionary War (b. 1711)
- May 28 – William Douglas, American military officer, leading regiments from Connecticut in the American Revolutionary War (b. 1742)
- May 31 – Henry Fane of Wormsley, English politician (b. 1703)
- June 8 – Cornelia Schlosser, sister and only sibling of Johann Wolfgang von Goethe to survive to adulthood (b. 1750)
- June 21 – Georg Friedrich Meier, German philosopher and aesthetician (b. 1718)
- July 4 – Consort Shu, consort of the Chinese Qianlong Emperor (b. 1728)
- July 13 – Guillaume Coustou the Younger, French artist (b. 1716)
- August 14
- August 23 – Celia Grillo Borromeo, Italian scientist, mathematician (b. 1684)
- August 30 – John Clavering, British Army officer (b. 1722)
- September 7 – Tekle Haymanot II, emperor of Ethiopia (b. 1754)
- September 16 – Simon Harcourt, 1st Earl Harcourt, English landowner, diplomat, general and Viceroy of India (b. 1714)
- September 18 – Princess Amalia of Nassau-Dietz, wife of Frederick (b. 1710)
- September 19 – Infante Philip, Duke of Calabria (b. 1747)
- September 20 – Edward Howard, 9th Duke of Norfolk, British peer (b. 1686)
- September 22 – John Bartram, American botanist (b. 1699)
- September 25 – Johann Heinrich Lambert, Swiss mathematician, physicist and astronomer (b. 1728)
- October 3 – Jeremias van Riemsdijk, Dutch colonial governor (b. 1712)
- October 4 – Francis Nash, American brigadier general, killed at the Battle of Germantown (b. c. 1742)
- October 6 – Marie Thérèse Rodet Geoffrin, French salon holder (b. 1699)
- October 7 – Simon Fraser of Balnain, Scottish general during the American Revolutionary War, killed in battle (b. 1729)
- October 21 – Samuel Foote, English dramatist and actor (b. 1720)
- October 25 – Carl von Donop, Hessian colonel fighting in the American Revolutionary War (b. 1732)
- October 27 – Charles Antoine de La Roche-Aymon, French cardinal-archbishop and Grand Almoner (b. 1697)
- October 30 – John Hart, American militia officer during King George's War and the French and Indian War (b. 1706)
- November 1 – Jonathan Hampton, American colonial surveyor (b. 1712)
- November 6 – Bernard de Jussieu, French naturalist (b. 1699)
- November 10 – Cornstalk, Shawnee chief (b. c. 1720)
- November 13 – William Bowyer, English printer (b. 1699)
- November 17 – Pratap Singh Shah, 2nd king of Nepal (b. 1751)
- November 18 – Thomas Foley, 1st Baron Foley, English landowner and politician (b. 1716)
- November 27 – Henry Stauffer, German settler in Bucks County, Pennsylvania (b. 1724)
- December 9 – Sir Charles Knowles, 1st Baronet, British Royal Navy officer (b. c. 1704)
- December 12 – Albrecht von Haller, Swiss anatomist and physiologist (b. 1708)
- December 25 – Charles Chauncey, English physician (b. 1706)
- December 26
- December 27 – Frederick Keppel, Church of England clergyman (b. 1728)
- December 30 – Maximilian III Joseph, Elector of Bavaria, Prince-elector of the Holy Roman Empire and Duke of Bavaria 1745–1777 (b. 1727)
- October 22 – Friedrich Baum, German dragoon Lieutenant Colonel of Brunswick in British service during the American Revolutionary War (b. 1748)
- Lossing, Benson John; Wilson, Woodrow, eds. (1910). Harper's Encyclopaedia of United States History from 458 A.D. to 1909. Harper & Brothers. p. 166.
- Vyas, Amee. "Georgia's County Governments." New Georgia Encyclopedia. 31 October 2018. Web. 05 February 2019.https://www.georgiaencyclopedia.org/articles/counties-cities-neighborhoods/georgias-county-governments
- King, Joseph (1899). Christianity in Polynesia: A Study and a Defence. William Brooks and Co. p. 71.
- Williams, Hywel (2005). Cassell's Chronology of World History. London: Weidenfeld & Nicolson. p. 331. ISBN 0-304-35730-8.
- Harris, Michael (2014). Brandywine: A Military History of the Battle that Lost Philadelphia but Saved America, September 11, 1777. El Dorado Hills, CA: Savas Beatiuùuù hie. p. 55. ISBN 978-1-61121-162-7.
- Ketchum, Richard M (1997). Saratoga: Turning Point of America's Revolutionary War. New York: Henry Holt. p. 52-55. ISBN 978-0-8050-6123-9. OCLC 41397623. (Paperback ISBN 0-8050-6123-1)
- Paavo Ruotsalainen – Aholansaari (in Finnish)
- "Maximilian III Joseph | elector of Bavaria | Britannica". www.britannica.com. Retrieved March 16, 2022.