1813
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| Gregorian calendar | 1813 MDCCCXIII | 
| Ab urbe condita | 2566 | 
| Armenian calendar | 1262 ԹՎ ՌՄԿԲ | 
| Assyrian calendar | 6563 | 
| Balinese saka calendar | 1734–1735 | 
| Bengali calendar | 1219–1220 | 
| Berber calendar | 2763 | 
| British Regnal year | 53 Geo. 3 – 54 Geo. 3 | 
| Buddhist calendar | 2357 | 
| Burmese calendar | 1175 | 
| Byzantine calendar | 7321–7322 | 
| Chinese calendar | 壬申年 (Water Monkey) 4510 or 4303 — to — 癸酉年 (Water Rooster) 4511 or 4304 | 
| Coptic calendar | 1529–1530 | 
| Discordian calendar | 2979 | 
| Ethiopian calendar | 1805–1806 | 
| Hebrew calendar | 5573–5574 | 
| Hindu calendars | |
| - Vikram Samvat | 1869–1870 | 
| - Shaka Samvat | 1734–1735 | 
| - Kali Yuga | 4913–4914 | 
| Holocene calendar | 11813 | 
| Igbo calendar | 813–814 | 
| Iranian calendar | 1191–1192 | 
| Islamic calendar | 1227–1229 | 
| Japanese calendar | Bunka 10 (文化10年) | 
| Javanese calendar | 1739–1740 | 
| Julian calendar | Gregorian minus 12 days | 
| Korean calendar | 4146 | 
| Minguo calendar | 99 before ROC 民前99年 | 
| Nanakshahi calendar | 345 | 
| Thai solar calendar | 2355–2356 | 
| Tibetan calendar | 阳水猴年 (male Water-Monkey) 1939 or 1558 or 786 — to — 阴水鸡年 (female Water-Rooster) 1940 or 1559 or 787 | 
Wikimedia Commons has media related to 1813.
1813 (MDCCCXIII) was a common year starting on Friday of the Gregorian calendar and a common year starting on Wednesday of the Julian calendar, the 1813th year of the Common Era (CE) and Anno Domini (AD) designations, the 813th year of the 2nd millennium, the 13th year of the 19th century, and the 4th year of the 1810s decade. As of the start of 1813, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
Clockwise from top left: The Battle of Leipzig was one of the largest battles of the Napoleonic Wars; The Battle of Lake Erie is controlled by American forces led by Oliver Hazard Perry after defeating the British; American forces under William Henry Harrison also defeated the British and their Native American allies during The Battle of the Thames; A  peace treaty between the Russian Empire and Persia (now Iran) leads to the end of the Russo-Persian War; Jane Austen publishes one of the most famous novels in English literature, Pride and Prejudice; British and Portuguese forces  besieged from the French; The Battle of Vitoria was a major battle where British, Portuguese, and Spanish forces under the Duke of Wellington defeated the French, leading to the collapse of French rule in Spain; Simón Bolívar enters Caracas after a series of victories in the Venezuelan War of Independence, leading to the temporary establishment of the Second Republic of Venezuela.