| Millennium: | 1st millennium |
|---|---|
| Centuries: | 7th century – 8th century – 9th century |
| Decades: | 750s 760s 770s – 780s – 790s 800s 810s |
| Years: | 777 778 779 – 780 – 781 782 783 |
| 780 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 780 DCCLXXX |
| Ab urbe condita | 1533 |
| Armenian calendar | 229 ԹՎ ՄԻԹ |
| Bahá'í calendar | -1064 – -1063 |
| Bengali calendar | 187 |
| Berber calendar | 1730 |
| Buddhist calendar | 1324 |
| Burmese calendar | 142 |
| Byzantine calendar | 6288 – 6289 |
| Chinese calendar | 己未年十一月二十日 (3416/3476-11-20) — to —
庚申年十二月初一日(3417/3477-12-1) |
| Coptic calendar | 496 – 497 |
| Ethiopian calendar | 772 – 773 |
| Hebrew calendar | 4540 – 4541 |
| Hindu calendars | |
| - Bikram Samwat | 836 – 837 |
| - Shaka Samvat | 702 – 703 |
| - Kali Yuga | 3881 – 3882 |
| Holocene calendar | 10780 |
| Iranian calendar | 158 – 159 |
| Islamic calendar | 163 – 164 |
| Japanese calendar | |
| Korean calendar | 3113 |
| Thai solar calendar | 1323 |