Back 1815 Abkhazian 1815 Afrikaans 1815 ALS 1815 እ.ኤ.አ. Amharic 1815 AN 1815 Arabic 1815 ARY 1815 ARZ 1815 AST 1815 AVK
| Millennium: | 2nd millennium |
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| 1815 by topic |
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| Gregorian calendar | 1815 MDCCCXV |
| Ab urbe condita | 2568 |
| Armenian calendar | 1264 ԹՎ ՌՄԿԴ |
| Assyrian calendar | 6565 |
| Balinese saka calendar | 1736–1737 |
| Bengali calendar | 1222 |
| Berber calendar | 2765 |
| British Regnal year | 55 Geo. 3 – 56 Geo. 3 |
| Buddhist calendar | 2359 |
| Burmese calendar | 1177 |
| Byzantine calendar | 7323–7324 |
| Chinese calendar | 甲戌年 (Wood Dog) 4512 or 4305 — to — 乙亥年 (Wood Pig) 4513 or 4306 |
| Coptic calendar | 1531–1532 |
| Discordian calendar | 2981 |
| Ethiopian calendar | 1807–1808 |
| Hebrew calendar | 5575–5576 |
| Hindu calendars | |
| - Vikram Samvat | 1871–1872 |
| - Shaka Samvat | 1736–1737 |
| - Kali Yuga | 4915–4916 |
| Holocene calendar | 11815 |
| Igbo calendar | 815–816 |
| Iranian calendar | 1193–1194 |
| Islamic calendar | 1230–1231 |
| Japanese calendar | Bunka 12 (文化１２年) |
| Javanese calendar | 1741–1742 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4148 |
| Minguo calendar | 97 before ROC 民前97年 |
| Nanakshahi calendar | 347 |
| Thai solar calendar | 2357–2358 |
| Tibetan calendar | 阳木狗年 (male Wood-Dog) 1941 or 1560 or 788 — to — 阴木猪年 (female Wood-Pig) 1942 or 1561 or 789 |
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1815 (MDCCCXV) was a common year starting on Sunday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1815th year of the Common Era (CE) and Anno Domini (AD) designations, the 815th year of the 2nd millennium, the 15th year of the 19th century, and the 6th year of the 1810s decade. As of the start of 1815, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.