| 309 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 309 BC |
| Ab urbe condita | 445 |
| Armenian calendar | N/A |
| Assyrian calendar | 4442 |
| Bahá'í calendar | -2152–-2151 |
| Bengali calendar | -901 |
| Berber calendar | 642 |
| English Regnal year | N/A |
| Buddhist calendar | 236 |
| Burmese calendar | -946 |
| Byzantine calendar | 5200–5201 |
| Chinese calendar | 辛亥年 (2328/2388) — to —
壬子年(2329/2389) |
| Coptic calendar | -592–-591 |
| Ethiopian calendar | -316–-315 |
| Hebrew calendar | 3452–3453 |
| Hindu calendars | |
| - Vikram Samvat | -252–-251 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2793–2794 |
| Holocene calendar | 9692 |
| Iranian calendar | 930 BP – 929 BP |
| Islamic calendar | 959 BH – 958 BH |
| Japanese calendar | |
| Korean calendar | 2025 |
| Minguo calendar | 2220 before ROC 民前2220年 |
| Thai solar calendar | 235 |
| Wikimedia Commons has media related to: 309 BC |
Year 309 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Dictatorship of Cursor (or, less frequently, year 445 Ab urbe condita). The denomination 309 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.
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