| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 800 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 800 DCCC |
| Ab urbe condita | 1553 |
| Armenian calendar | 249 ԹՎ ՄԽԹ |
| Assyrian calendar | 5550 |
| Balinese saka calendar | 721–722 |
| Bengali calendar | 207 |
| Berber calendar | 1750 |
| Buddhist calendar | 1344 |
| Burmese calendar | 162 |
| Byzantine calendar | 6308–6309 |
| Chinese calendar | 己卯年 (Earth Rabbit) 3497 or 3290 — to — 庚辰年 (Metal Dragon) 3498 or 3291 |
| Coptic calendar | 516–517 |
| Discordian calendar | 1966 |
| Ethiopian calendar | 792–793 |
| Hebrew calendar | 4560–4561 |
| Hindu calendars | |
| - Vikram Samvat | 856–857 |
| - Shaka Samvat | 721–722 |
| - Kali Yuga | 3900–3901 |
| Holocene calendar | 10800 |
| Iranian calendar | 178–179 |
| Islamic calendar | 183–184 |
| Japanese calendar | Enryaku 19 (延暦１９年) |
| Javanese calendar | 695–696 |
| Julian calendar | 800 DCCC |
| Korean calendar | 3133 |
| Minguo calendar | 1112 before ROC 民前1112年 |
| Nanakshahi calendar | −668 |
| Seleucid era | 1111/1112 AG |
| Thai solar calendar | 1342–1343 |
| Tibetan calendar | 阴土兔年 (female Earth-Rabbit) 926 or 545 or −227 — to — 阳金龙年 (male Iron-Dragon) 927 or 546 or −226 |
Year 800 (DCCC) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar, the 800th year of the Common Era (CE) and Anno Domini (AD) designations, the 800th year of the 1st millennium, the 100th and last year of the 8th century, and the 1st year of the 800s decade. It was around this time that the Anno Domini calendar era became the prevalent method in Europe for naming years, so from this time on, the years began to be known as 800 and onwards.