| Millennium: | 2nd Millennium BC |
|---|---|
| Centuries: | 20th cent. BC – 19th cent. BC – 18th cent. BC |
| Decades: | 1830s BC 1820s BC 1810s BC – 1800s BC – 1790s BC 1780s BC 1770s BC |
| Years: | 1809 BC 1808 BC 1807 BC – 1806 BC – 1805 BC 1804 BC 1803 BC |
| Gregorian calendar | 1806 MDCCCVI |
| Ab urbe condita | 2559 |
| Armenian calendar | 1255 ԹՎ ՌՄԾԵ |
| Assyrian calendar | 6556 |
| Bengali calendar | 1213 |
| Berber calendar | 2756 |
| British Regnal year | 46 Geo. 3 – 47 Geo. 3 |
| Buddhist calendar | 2350 |
| Burmese calendar | 1168 |
| Byzantine calendar | 7314–7315 |
| Chinese calendar | 乙丑年 (Wood Ox) 4502 or 4442 — to — 丙寅年 (Fire Tiger) 4503 or 4443 |
| Coptic calendar | 1522–1523 |
| Discordian calendar | 2972 |
| Ethiopian calendar | 1798–1799 |
| Hebrew calendar | 5566–5567 |
| Hindu calendars | |
| - Vikram Samvat | 1862–1863 |
| - Shaka Samvat | 1727–1728 |
| - Kali Yuga | 4906–4907 |
| Holocene calendar | 11806 |
| Igbo calendar | 806–807 |
| Iranian calendar | 1184–1185 |
| Islamic calendar | 1220–1221 |
| Japanese calendar | Bunka 3 (文化３年) |
| Javanese calendar | 1732–1733 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4139 |
| Minguo calendar | 106 before ROC 民前106年 |
| Nanakshahi calendar | 338 |
| Thai solar calendar | 2348–2349 |
The year 1806 BC