| Centuries: | 3rd century · 4th century · 5th century |
| Decades: | 280s 290s 300s 310s 320s 330s 340s |
| Years: | 312 313 314 315 316 317 318 |
| 315 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 315 CCCXV |
| Ab urbe condita | 1068 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1529 – -1528 |
| Bengali calendar | -278 |
| Berber calendar | 1265 |
| Buddhist calendar | 859 |
| Burmese calendar | -323 |
| Byzantine calendar | 5823 – 5824 |
| Chinese calendar | 甲戌年十一月初十日 (2951/3011-11-10) — to —
乙亥年十一月十九日(2952/3012-11-19) |
| Coptic calendar | 31 – 32 |
| Ethiopian calendar | 307 – 308 |
| Hebrew calendar | 4075 – 4076 |
| Hindu calendars | |
| - Bikram Samwat | 371 – 372 |
| - Shaka Samvat | 237 – 238 |
| - Kali Yuga | 3416 – 3417 |
| Holocene calendar | 10315 |
| Iranian calendar | 307 BP – 306 BP |
| Islamic calendar | 316 BH – 315 BH |
| Japanese calendar | |
| Korean calendar | 2648 |
| Thai solar calendar | 858 |