| Millennium: | 2nd millennium |
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| 1805 by topic |
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| Humanities |
| By country |
| Other topics |
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 1805 MDCCCV |
| French Republican calendar | 13–14 |
| Ab urbe condita | 2558 |
| Armenian calendar | 1254 ԹՎ ՌՄԾԴ |
| Assyrian calendar | 6555 |
| Balinese saka calendar | 1726–1727 |
| Bengali calendar | 1212 |
| Berber calendar | 2755 |
| British Regnal year | 45 Geo. 3 – 46 Geo. 3 |
| Buddhist calendar | 2349 |
| Burmese calendar | 1167 |
| Byzantine calendar | 7313–7314 |
| Chinese calendar | 甲子年 (Wood Rat) 4502 or 4295 — to — 乙丑年 (Wood Ox) 4503 or 4296 |
| Coptic calendar | 1521–1522 |
| Discordian calendar | 2971 |
| Ethiopian calendar | 1797–1798 |
| Hebrew calendar | 5565–5566 |
| Hindu calendars | |
| - Vikram Samvat | 1861–1862 |
| - Shaka Samvat | 1726–1727 |
| - Kali Yuga | 4905–4906 |
| Holocene calendar | 11805 |
| Igbo calendar | 805–806 |
| Iranian calendar | 1183–1184 |
| Islamic calendar | 1219–1220 |
| Japanese calendar | Bunka 2 (文化２年) |
| Javanese calendar | 1731–1732 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4138 |
| Minguo calendar | 107 before ROC 民前107年 |
| Nanakshahi calendar | 337 |
| Thai solar calendar | 2347–2348 |
| Tibetan calendar | 阳木鼠年 (male Wood-Rat) 1931 or 1550 or 778 — to — 阴木牛年 (female Wood-Ox) 1932 or 1551 or 779 |
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1805 (MDCCCV) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1805th year of the Common Era (CE) and Anno Domini (AD) designations, the 805th year of the 2nd millennium, the 5th year of the 19th century, and the 6th year of the 1800s decade. As of the start of 1805, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
After thirteen years the First French Empire abolished the French Republican Calendar in favour of the Gregorian calendar.