| Millennium: | 1st millennium |
|---|---|
| Centuries: | 7th century – 8th century – 9th century |
| Decades: | 740s 750s 760s – 770s – 780s 790s 800s |
| Years: | 775 776 777 – 778 – 779 780 781 |
| 778 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 778 DCCLXXVIII |
| Ab urbe condita | 1531 |
| Armenian calendar | 227 ԹՎ ՄԻԷ |
| Bahá'í calendar | -1066 – -1065 |
| Bengali calendar | 185 |
| Berber calendar | 1728 |
| Buddhist calendar | 1322 |
| Burmese calendar | 140 |
| Byzantine calendar | 6286 – 6287 |
| Chinese calendar | 丁巳年十一月廿八日 (3414/3474-11-28) — to —
戊午年十二月初八日(3415/3475-12-8) |
| Coptic calendar | 494 – 495 |
| Ethiopian calendar | 770 – 771 |
| Hebrew calendar | 4538 – 4539 |
| Hindu calendars | |
| - Bikram Samwat | 834 – 835 |
| - Shaka Samvat | 700 – 701 |
| - Kali Yuga | 3879 – 3880 |
| Holocene calendar | 10778 |
| Iranian calendar | 156 – 157 |
| Islamic calendar | 161 – 162 |
| Japanese calendar | |
| Korean calendar | 3111 |
| Thai solar calendar | 1321 |