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.
- January 2 - American Revolutionary War: American forces under the command of George Washington repulsed a British attack at the Battle of the Assunpink Creek near Trenton, New Jersey.
- January 3 – American Revolutionary War – Battle of Princeton: American general George Washington's army defeats British troops.
- January 11 – 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 12 – Mission Santa Clara de Asís is founded in what is now 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 20 – The Continental Congress approves a resolution "that an authentic copy, with names of the signers of the Declaration of independence, be sent to each of the United States. 
- February 24 – King Joseph I of Portugal dies, and is succeeded by his brother and son-in-law Peter III of Portugal, and his daughter Maria I of Portugal.
- March 4 – The Fourth Continental Congress, with John Hancock as President, begins a 199 day session in Philadelphia, lasting until September 18. 
- March 29 and March 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 3 days later.
- June 13 – American Revolution: The Marquis de Lafayette lands near Georgetown, South Carolina, to help the Continental Congress train its army.
- July 8 – The 1777 Constitution of Vermont is signed, officially abolishing slavery.
- 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.
- 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.
- 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 an 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 the recent victory by the American rebels over British General John Burgoyne at Saratoga in October.
- 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, & is succeeded by his distant cousin Charles Theodore, Elector of Bavaria.
- 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), U.S. Representative (d. 1840)
- March 13 – Charles Lot Church, Nova Scotia politician (d. 1864)
- 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 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 – Henry Hallam, English historian (d. 1859)
- 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)
- November 7 – Richard Bassett (clergyman), Welsh cleric (d. 1852)
- 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 21 – John Campbell, 7th Duke of Argyll, Scottish peer, Whig politician (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)
- February 24 – King Joseph I of Portugal (b. 1714)
- March 1 – Georg Christoph Wagenseil, Austrian composer (b. 1715)
- March 2 – Empress Xiaoshengxian, the mother of the Qianlong Emperor of China (b. 1711)
- March 20 – Jean-François-Joseph de Rochechouart, French Catholic Cardinal (b. 1708)
- March 23 – Sir Hugh Paterson, 2nd Baronet of Bannockburn (b. 1685)
- May 11 – George Pigot, 1st Baron Pigot, British governor of Madras (b. 1719)
- May 19 – Button Gwinnett, signatory of the American Declaration of Independence (b. 1735)
- August 23 – Celia Grillo Borromeo, Italian scientist, mathematician (b. 1684)
- September 20 – Edward Howard, 9th Duke of Norfolk, British peer (b. 1686)
- September 22 – John Bartram, American botanist (b. 1699)
- September 25 – Johann H. Lambert, Swiss mathematician, physicist and astronomer (b. 1728)
- October 4 – Francis Nash, American brigadier general, killed at the Battle of Germantown (b. c. 1742)
- ^ a b c d Harper's Encyclopaedia of United States History from 458 A. D. to 1909, ed. by Benson John Lossing and, Woodrow Wilson (Harper & Brothers, 1910) p166
- ^ Rev. Joseph King, Christianity in Polynesia: A Study and a Defence (William Brooks and Co., 1899) p71
- ^ Williams, Hywel (2005). Cassell's Chronology of World History. London: Weidenfeld & Nicolson. p. 331. ISBN 0-304-35730-8.
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