| Centuries: | 5th century BC - 4th century BC - 3rd century BC |
| Decades: | 370s BC 360s BC 350s BC - 340s BC - 330s BC 320s BC 310s BC |
| Years: | 345 BC 344 BC 343 BC - 342 BC - 341 BC 340 BC 339 BC |
| 342 BC by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 342 BC |
| Ab urbe condita | 412 |
| Armenian calendar | N/A |
| Bahá'í calendar | -2185 – -2184 |
| Berber calendar | 609 |
| Buddhist calendar | 203 |
| Burmese calendar | -979 |
| Chinese calendar | 2295/2355 ([[Sexagenary cycle|]]年) — to —
2296/2356([[Sexagenary cycle|]]年) |
| Coptic calendar | -625 – -624 |
| Ethiopian calendar | -349 – -348 |
| Hebrew calendar | 3419 – 3420 |
| Hindu calendars | |
| - Vikram Samvat | -286 – -285 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2760 – 2761 |
| Holocene calendar | 9659 |
| Iranian calendar | 963 BP – 962 BP |
| Islamic calendar | 993 BH – 992 BH |
| Japanese calendar | |
| Korean calendar | 1992 |
| Thai solar calendar | 202 |