| 285 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 285 BC |
| Ab urbe condita | 469 |
| Armenian calendar | N/A |
| Bahá'í calendar | -2128 – -2127 |
| Berber calendar | 666 |
| Buddhist calendar | 260 |
| Burmese calendar | -922 |
| Byzantine calendar | 5224 – 5225 |
| Chinese calendar | [[Sexagenary cycle|]]年 (2352/2412) — to —
子年(2353/2413) |
| Coptic calendar | -568 – -567 |
| Ethiopian calendar | -292 – -291 |
| Hebrew calendar | 3476 – 3477 |
| Hindu calendars | |
| - Vikram Samvat | -229 – -228 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2817 – 2818 |
| Holocene calendar | 9716 |
| Iranian calendar | 906 BP – 905 BP |
| Islamic calendar | 934 BH – 933 BH |
| Japanese calendar | |
| Korean calendar | 2049 |
| Thai solar calendar | 259 |
Events
By place
Egypt
- June 26 – Egypt's Ptolemy I Soter abdicates. He is succeeded by his youngest son by his wife Berenice, Ptolemy II Philadelphus, who has been co-regent for three years.
- A 110 metre tall lighthouse on the island of Pharos in Alexandria's harbour is completed and serves as a landmark for ships in the eastern Mediterranean. Built by Sostratus of Cnidus for Ptolemy II of Egypt, it is one of the seven wonders of the ancient world. It is a technological triumph and is the archetype of all lighthouses since. A broad spiral ramp leads to the top, where a fire burns at night.
Seleucid Empire
- Demetrius Poliorcetes is deserted by his troops and surrenders to Seleucus at Cilicia, where Seleucus keeps him a prisoner.
Births
Deaths
- Dicaearchus, Greek philosopher, cartographer, geographer, mathematician and author (b. c. 350 BC)
- Theophrastus, Greek philosopher, a native of Eressos in Lesbos, the successor of Aristotle in the Peripatetic school (b. c. 370 BC)
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