1818

1818 in various calendars
Gregorian calendar	1818; MDCCCXVIII
Ab urbe condita	2571
Armenian calendar	1267; ԹՎ ՌՄԿԷ
Assyrian calendar	6568
Balinese saka calendar	1739–1740
Bengali calendar	1225
Berber calendar	2768
British Regnal year	58 Geo. 3 – 59 Geo. 3
Buddhist calendar	2362
Burmese calendar	1180
Byzantine calendar	7326–7327
Chinese calendar	丁丑年 (Fire Ox); 4515 or 4308; — to —; 戊寅年 (Earth Tiger); 4516 or 4309
Coptic calendar	1534–1535
Discordian calendar	2984
Ethiopian calendar	1810–1811
Hebrew calendar	5578–5579
Hindu calendars
- Vikram Samvat	1874–1875
- Shaka Samvat	1739–1740
- Kali Yuga	4918–4919
Holocene calendar	11818
Igbo calendar	818–819
Iranian calendar	1196–1197
Islamic calendar	1233–1234
Japanese calendar	Bunka 15 / Bunsei 1; (文政元年)
Javanese calendar	1745–1746
Julian calendar	Gregorian minus 12 days
Korean calendar	4151
Minguo calendar	94 before ROC; 民前94年
Nanakshahi calendar	350
Thai solar calendar	2360–2361
Tibetan calendar	阴火牛年; (female Fire-Ox); 1944 or 1563 or 791; — to —; 阳土虎年; (male Earth-Tiger); 1945 or 1564 or 792

Millennium:	2nd millennium
Centuries:	18th century; 19th century ; 20th century;
Decades:	1790s; 1800s; 1810s ; 1820s; 1830s;
Years:	1815; 1816; 1817; 1818 ; 1819; 1820; 1821;

1818 (MDCCCXVIII) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Tuesday of the Julian calendar, the 1818th year of the Common Era (CE) and Anno Domini (AD) designations, the 818th year of the 2nd millennium, the 18th year of the 19th century, and the 9th year of the 1810s decade. As of the start of 1818, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.

Events

January–June

January 1
- Battle of Koregaon: Troops of the British East India Company score a decisive victory over the Maratha Empire.
January 3 (21:52 UTC) – Venus occults Jupiter. It is the last occultation of one planet by another before November 22, 2065.
January 6 – Treaty of Mandeswar brings an end to the Third Anglo-Maratha War, ending the dominance of Marathas, and enhancing the power of the British East India Company, which controls territory occupied by 180 million Indians.
January 11 – Percy Bysshe Shelley's "Ozymandias" is published pseudonymously in London.
February 5 – Upon his death, King Charles XIII of Sweden (Charles II of Norway) is succeeded on both thrones by his adoptive son Charles XIV/III John, starting the Royal House of Bernadotte.
February 12 – Chile proclaims its independence from Spain.
March 11 – Mary Shelley's Frankenstein is published anonymously in London.
March 15 – First Seminole War: General Andrew Jackson and his American army invade Florida.
March 22 – Easter Day in Western Christianity falls on its earliest possible date. In Western Christianity, it will not occur on this date again until 2285.
April – John Ross sets sail in search of the Northwest Passage.
April 1 – First Seminole War: Battle of Miccosukee, Florida: General Andrew Jackson defeats chief Kinhagee.
April 4 – The United States Congress adopts the flag of the United States as having thirteen red and white stripes and one star for each state (twenty) with additional stars to be added whenever a new state is added to the Union.
April 5 – Battle of Maipú in the Chilean War of Independence: Patriot rebels led by José de San Martín decisively defeat the Spanish Royalists.
April 7 – Brooks Brothers, the oldest men's clothier in the United States, opens its first store on the northeast corner of Catherine and Cherry Streets in New York City, where the later South Street Seaport stands.
April 14–August 9 – United States Survey of the Coast operations suspended.
May 11 – Charles XIV of Sweden–Norway is crowned king of Sweden.
The Westmorland Gazette is first published at Kendal in the Lake District of England; in July, Thomas De Quincey will begin a 16-month term as editor.

July–December

August 1 – Separate Topographical Bureau of the United States Department of War established.
September – Sir Stamford Raffles sets out to visit Lord Hastings, the Governor-General of India, to gain his approval to establish a trading station at the southern tip of the Malay Peninsula (modern-day Singapore).
September 7 – Carl III of Sweden–Norway is crowned king of Norway, in Trondheim.
September 23 – Border markers are formally installed for the European territory of Moresnet.
October 5 – Claudine Thévenet (known as 'Mary of St. Ignatius') founds the Roman Catholic order Religieuses de Jésus-Marie ("Religious of Jesus And Mary") in Lyon, France.
October 20 – Treaty between the U.S. and the United Kingdom establishes the boundary between the U.S. and British North America as the 49th parallel from the Lake of the Woods to the Rocky Mountains, also creating the Northwest Angle.
November 11 – Anglo-Chinese College is founded by Robert Morrison in Malacca (later renamed Ying Wa College).
November 16 – The Saint Louis Academy, which later becomes Saint Louis University, is founded by Reverend Louis William Valentine Dubourg.
December 3 – Illinois is admitted as the 21st U.S. state.
December 13 – Cyril VI of Constantinople quits his place as an Ecumenical Pariarch.
December 24 – The Christmas carol "Silent Night" (Stille Nacht) with words by the priest Josef Mohr set to music by organist Franz Xaver Gruber is first performed at St. Nikolaus parish church in Oberndorf bei Salzburg in Austria.

Date unknown

The Afghans defeat a Persian invasion at the Battle of Kafir Qala.
The Old Vic theatre founded (as the Royal Coburg Hall) in London.
The first edition of the Farmers' Almanac is published in the United States.
First Serbian dictionary, made by Vuk Karadžić.
Besses o' th' Barn brass band is formed in Whitefield, near Manchester, by this date.