| Millennium: | 1st millennium |
|---|---|
| Centuries: | 7th century – 8th century – 9th century |
| Decades: | 760s 770s 780s – 790s – 800s 810s 820s |
| Years: | 788 789 790 – 791 – 792 793 794 |
| 791 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 791 DCCXCI |
| Ab urbe condita | 1544 |
| Armenian calendar | 240 ԹՎ ՄԽ |
| Assyrian calendar | 5541 |
| Bahá'í calendar | -1053–-1052 |
| Bengali calendar | 198 |
| Berber calendar | 1741 |
| English Regnal year | N/A |
| Buddhist calendar | 1335 |
| Burmese calendar | 153 |
| Byzantine calendar | 6299–6300 |
| Chinese calendar | 庚午年十一月廿二日 (3427/3487-11-22) — to —
辛未年十二月初二日(3428/3488-12-2) |
| Coptic calendar | 507–508 |
| Ethiopian calendar | 783–784 |
| Hebrew calendar | 4551–4552 |
| Hindu calendars | |
| - Vikram Samvat | 847–848 |
| - Shaka Samvat | 713–714 |
| - Kali Yuga | 3892–3893 |
| Holocene calendar | 10791 |
| Iranian calendar | 169–170 |
| Islamic calendar | 174–175 |
| Japanese calendar | |
| Korean calendar | 3124 |
| Minguo calendar | 1121 before ROC 民前1121年 |
| Thai solar calendar | 1334 |
Year 791 (DCCXCI) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 791 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.