| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 813 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 813 DCCCXIII |
| Ab urbe condita | 1566 |
| Armenian calendar | 262 ԹՎ ՄԿԲ |
| Assyrian calendar | 5563 |
| Balinese saka calendar | 734–735 |
| Bengali calendar | 220 |
| Berber calendar | 1763 |
| Buddhist calendar | 1357 |
| Burmese calendar | 175 |
| Byzantine calendar | 6321–6322 |
| Chinese calendar | 壬辰年 (Water Dragon) 3510 or 3303 — to — 癸巳年 (Water Snake) 3511 or 3304 |
| Coptic calendar | 529–530 |
| Discordian calendar | 1979 |
| Ethiopian calendar | 805–806 |
| Hebrew calendar | 4573–4574 |
| Hindu calendars | |
| - Vikram Samvat | 869–870 |
| - Shaka Samvat | 734–735 |
| - Kali Yuga | 3913–3914 |
| Holocene calendar | 10813 |
| Iranian calendar | 191–192 |
| Islamic calendar | 197–198 |
| Japanese calendar | Kōnin 4 (弘仁４年) |
| Javanese calendar | 709–710 |
| Julian calendar | 813 DCCCXIII |
| Korean calendar | 3146 |
| Minguo calendar | 1099 before ROC 民前1099年 |
| Nanakshahi calendar | −655 |
| Seleucid era | 1124/1125 AG |
| Thai solar calendar | 1355–1356 |
| Tibetan calendar | 阳水龙年 (male Water-Dragon) 939 or 558 or −214 — to — 阴水蛇年 (female Water-Snake) 940 or 559 or −213 |
813 (DCCCXIII) was a common year starting on Saturday of the Julian calendar, the 813th year of the Common Era (CE) and Anno Domini (AD) designations, the 813th year of the 1st millennium, the 13th year of the 9th century, and the 4th year of the 810s decade. As of the start of 813, the Gregorian calendar was 4 days ahead of the Julian calendar, which was the dominant calendar of the time.