| Centuries: | 3rd century · 4th century · 5th century |
| Decades: | 280s 290s 300s 310s 320s 330s 340s |
| Years: | 315 316 317 318 319 320 321 |
| 318 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 318 CCCXVIII |
| Ab urbe condita | 1071 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1526 – -1525 |
| Bengali calendar | -275 |
| Berber calendar | 1268 |
| Buddhist calendar | 862 |
| Burmese calendar | -320 |
| Byzantine calendar | 5826 – 5827 |
| Chinese calendar | 丁丑年十一月十三日 (2954/3014-11-13) — to —
戊寅年十一月廿三日(2955/3015-11-23) |
| Coptic calendar | 34 – 35 |
| Ethiopian calendar | 310 – 311 |
| Hebrew calendar | 4078 – 4079 |
| Hindu calendars | |
| - Bikram Samwat | 374 – 375 |
| - Shaka Samvat | 240 – 241 |
| - Kali Yuga | 3419 – 3420 |
| Holocene calendar | 10318 |
| Iranian calendar | 304 BP – 303 BP |
| Islamic calendar | 313 BH – 312 BH |
| Japanese calendar | |
| Korean calendar | 2651 |
| Thai solar calendar | 861 |