| Centuries: | 3rd century · 4th century · 5th century |
| Decades: | 340s 350s 360s 370s 380s 390s 400s |
| Years: | 375 376 377 378 379 380 381 |
| 378 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 378 CCCLXXVIII |
| Ab urbe condita | 1131 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1466 – -1465 |
| Bengali calendar | -215 |
| Berber calendar | 1328 |
| Buddhist calendar | 922 |
| Burmese calendar | -260 |
| Byzantine calendar | 5886 – 5887 |
| Chinese calendar | 丁丑年十一月十六日 (3014/3074-11-16) — to —
戊寅年十一月廿六日(3015/3075-11-26) |
| Coptic calendar | 94 – 95 |
| Ethiopian calendar | 370 – 371 |
| Hebrew calendar | 4138 – 4139 |
| Hindu calendars | |
| - Bikram Samwat | 434 – 435 |
| - Shaka Samvat | 300 – 301 |
| - Kali Yuga | 3479 – 3480 |
| Holocene calendar | 10378 |
| Iranian calendar | 244 BP – 243 BP |
| Islamic calendar | 252 BH – 251 BH |
| Japanese calendar | |
| Korean calendar | 2711 |
| Thai solar calendar | 921 |