| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 805 DCCCV |
| Ab urbe condita | 1558 |
| Armenian calendar | 254 ԹՎ ՄԾԴ |
| Assyrian calendar | 5555 |
| Bengali calendar | 212 |
| Berber calendar | 1755 |
| Buddhist calendar | 1349 |
| Burmese calendar | 167 |
| Byzantine calendar | 6313–6314 |
| Chinese calendar |
甲申年 (Wood Monkey) 3501 or 3441 — to — 乙酉年 (Wood Rooster) 3502 or 3442 |
| Coptic calendar | 521–522 |
| Discordian calendar | 1971 |
| Ethiopian calendar | 797–798 |
| Hebrew calendar | 4565–4566 |
| Hindu calendars | |
| - Vikram Samvat | 861–862 |
| - Shaka Samvat | 726–727 |
| - Kali Yuga | 3905–3906 |
| Holocene calendar | 10805 |
| Iranian calendar | 183–184 |
| Islamic calendar | 189–190 |
| Japanese calendar |
Enryaku 24 (延暦24年) |
| Javanese calendar | 700–701 |
| Julian calendar | 805 DCCCV |
| Korean calendar | 3138 |
| Minguo calendar | 1107 before ROC 民前1107年 |
| Nanakshahi calendar | −663 |
| Seleucid era | 1116/1117 AG |
| Thai solar calendar | 1347–1348 |
Year 805 (DCCCV) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.