| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 778 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 778 DCCLXXVIII |
| Ab urbe condita | 1531 |
| Armenian calendar | 227 ԹՎ ՄԻԷ |
| Assyrian calendar | 5528 |
| Balinese saka calendar | 699–700 |
| Bengali calendar | 185 |
| Berber calendar | 1728 |
| Buddhist calendar | 1322 |
| Burmese calendar | 140 |
| Byzantine calendar | 6286–6287 |
| Chinese calendar | 丁巳年 (Fire Snake) 3475 or 3268 — to — 戊午年 (Earth Horse) 3476 or 3269 |
| Coptic calendar | 494–495 |
| Discordian calendar | 1944 |
| Ethiopian calendar | 770–771 |
| Hebrew calendar | 4538–4539 |
| Hindu calendars | |
| - Vikram Samvat | 834–835 |
| - Shaka Samvat | 699–700 |
| - Kali Yuga | 3878–3879 |
| Holocene calendar | 10778 |
| Iranian calendar | 156–157 |
| Islamic calendar | 161–162 |
| Japanese calendar | Hōki 9 (宝亀９年) |
| Javanese calendar | 673–674 |
| Julian calendar | 778 DCCLXXVIII |
| Korean calendar | 3111 |
| Minguo calendar | 1134 before ROC 民前1134年 |
| Nanakshahi calendar | −690 |
| Seleucid era | 1089/1090 AG |
| Thai solar calendar | 1320–1321 |
| Tibetan calendar | 阴火蛇年 (female Fire-Snake) 904 or 523 or −249 — to — 阳土马年 (male Earth-Horse) 905 or 524 or −248 |
Year 778 (DCCLXXVIII) was a common year starting on Thursday of the Julian calendar, the 778th year of the Common Era (CE) and Anno Domini (AD) designations, the 778th year of the 1st millennium, the 78th year of the 8th century, and the 9th year of the 770s decade. 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.