| 345 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 345 BC |
| Ab urbe condita | 409 |
| Armenian calendar | N/A |
| Assyrian calendar | 4406 |
| Bahá'í calendar | -2188–-2187 |
| Bengali calendar | -937 |
| Berber calendar | 606 |
| English Regnal year | N/A |
| Buddhist calendar | 200 |
| Burmese calendar | -982 |
| Byzantine calendar | 5164–5165 |
| Chinese calendar | 乙亥年 (2292/2352) — to —
丙子年(2293/2353) |
| Coptic calendar | -628–-627 |
| Ethiopian calendar | -352–-351 |
| Hebrew calendar | 3416–3417 |
| Hindu calendars | |
| - Vikram Samvat | -288–-287 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2757–2758 |
| Holocene calendar | 9656 |
| Iranian calendar | 966 BP – 965 BP |
| Islamic calendar | 996 BH – 995 BH |
| Japanese calendar | |
| Korean calendar | 1989 |
| Minguo calendar | 2256 before ROC 民前2256年 |
| Thai solar calendar | 199 |
Year 345 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Dorsuo and Camerinus (or, less frequently, year 409 Ab urbe condita). The denomination 345 BC 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.