| Centuries: | 5th century BC - 4th century BC - 3rd century BC |
| Decades: | 420s BC 410s BC 400s BC - 390s BC - 380s BC 370s BC 360s BC |
| Years: | 394 BC 393 BC 392 BC - 391 BC - 390 BC 389 BC 388 BC |
| 391 BC by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 391 BC |
| Ab urbe condita | 363 |
| Armenian calendar | N/A |
| Bahá'í calendar | -2234 – -2233 |
| Berber calendar | 560 |
| Buddhist calendar | 154 |
| Burmese calendar | -1028 |
| Chinese calendar | 2246/2306 ([[Sexagenary cycle|]]年) — to —
2247/2307([[Sexagenary cycle|]]年) |
| Coptic calendar | -674 – -673 |
| Ethiopian calendar | -398 – -397 |
| Hebrew calendar | 3370 – 3371 |
| Hindu calendars | |
| - Vikram Samvat | -335 – -334 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2711 – 2712 |
| Holocene calendar | 9610 |
| Iranian calendar | 1012 BP – 1011 BP |
| Islamic calendar | 1043 BH – 1042 BH |
| Japanese calendar | |
| Korean calendar | 1943 |
| Thai solar calendar | 153 |