| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 816 DCCCXVI |
| Ab urbe condita | 1569 |
| Armenian calendar | 265 ԹՎ ՄԿԵ |
| Assyrian calendar | 5566 |
| Bengali calendar | 223 |
| Berber calendar | 1766 |
| Buddhist calendar | 1360 |
| Burmese calendar | 178 |
| Byzantine calendar | 6324–6325 |
| Chinese calendar |
乙未年 (Wood Goat) 3512 or 3452 — to — 丙申年 (Fire Monkey) 3513 or 3453 |
| Coptic calendar | 532–533 |
| Discordian calendar | 1982 |
| Ethiopian calendar | 808–809 |
| Hebrew calendar | 4576–4577 |
| Hindu calendars | |
| - Vikram Samvat | 872–873 |
| - Shaka Samvat | 737–738 |
| - Kali Yuga | 3916–3917 |
| Holocene calendar | 10816 |
| Iranian calendar | 194–195 |
| Islamic calendar | 200–201 |
| Japanese calendar |
Kōnin 7 (弘仁7年) |
| Javanese calendar | 712–713 |
| Julian calendar | 816 DCCCXVI |
| Korean calendar | 3149 |
| Minguo calendar | 1096 before ROC 民前1096年 |
| Nanakshahi calendar | −652 |
| Seleucid era | 1127/1128 AG |
| Thai solar calendar | 1358–1359 |
Year 816 (DCCCXVI) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar.