| 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 |
| Assyrian calendar | 5528 |
| Bahá'í calendar | -1066–-1065 |
| Bengali calendar | 185 |
| Berber calendar | 1728 |
| English Regnal year | N/A |
| 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 | |
| - Vikram Samvat | 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 |
| Minguo calendar | 1134 before ROC 民前1134年 |
| Thai solar calendar | 1321 |
Year 778 (DCCLXXVIII) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar. The denomination 778 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.