| 261 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 261 BC |
| Ab urbe condita | 493 |
| Armenian calendar | N/A |
| Bahá'í calendar | -2104 – -2103 |
| Berber calendar | 690 |
| Buddhist calendar | 284 |
| Burmese calendar | -898 |
| Byzantine calendar | 5248 – 5249 |
| Chinese calendar | [[Sexagenary cycle|]]年 (2376/2436) — to —
子年(2377/2437) |
| Coptic calendar | -544 – -543 |
| Ethiopian calendar | -268 – -267 |
| Hebrew calendar | 3500 – 3501 |
| Hindu calendars | |
| - Vikram Samvat | -205 – -204 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2841 – 2842 |
| Holocene calendar | 9740 |
| Iranian calendar | 882 BP – 881 BP |
| Islamic calendar | 909 BH – 908 BH |
| Japanese calendar | |
| Korean calendar | 2073 |
| Thai solar calendar | 283 |
Events
By place
Roman Republic
- The Romans, determined to win control of Sicily from Carthage, build a fleet based on the model of a captured Carthaginian quinquereme.
Seleucid Empire
- The new Seleucid king Antiochus II reaches an agreement with the king of Macedonia, Antigonus II Gonatas, to work together in trying to push Ptolemy II's fleet and armies out of the Aegean Sea. With Macedonia's support, Antiochus II launches an attack on Ptolemaic outposts in Asia Minor.
Births
Deaths
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