| Millennium: | 1st millennium |
|---|---|
| Centuries: | 2nd century – 3rd century – 4th century |
| Decades: | 230s 240s 250s – 260s – 270s 280s 290s |
| Years: | 263 264 265 – 266 – 267 268 269 |
| 266 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 266 CCLXVI |
| Ab urbe condita | 1019 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1578 – -1577 |
| Bengali calendar | -327 |
| Berber calendar | 1216 |
| Buddhist calendar | 810 |
| Burmese calendar | -372 |
| Byzantine calendar | 5774 – 5775 |
| Chinese calendar | 乙酉年閏十一月初八日 (2902/2962-intercalary 11-8) — to —
丙戌年十一月十八日(2903/2963-11-18) |
| Coptic calendar | -18 – -17 |
| Ethiopian calendar | 258 – 259 |
| Hebrew calendar | 4026 – 4027 |
| Hindu calendars | |
| - Bikram Samwat | 322 – 323 |
| - Shaka Samvat | 188 – 189 |
| - Kali Yuga | 3367 – 3368 |
| Holocene calendar | 10266 |
| Iranian calendar | 356 BP – 355 BP |
| Islamic calendar | 367 BH – 366 BH |
| Japanese calendar | |
| Korean calendar | 2599 |
| Thai solar calendar | 809 |