| Centuries: | 3rd century · 4th century · 5th century |
| Decades: | 310s 320s 330s 340s 350s 360s 370s |
| Years: | 342 343 344 345 346 347 348 |
| 345 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 345 CCCXLV |
| Ab urbe condita | 1098 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1499 – -1498 |
| Bengali calendar | -248 |
| Berber calendar | 1295 |
| Buddhist calendar | 889 |
| Burmese calendar | -293 |
| Byzantine calendar | 5853 – 5854 |
| Chinese calendar | 甲辰年十一月十二日 (2981/3041-11-12) — to —
乙巳年十一月廿一日(2982/3042-11-21) |
| Coptic calendar | 61 – 62 |
| Ethiopian calendar | 337 – 338 |
| Hebrew calendar | 4105 – 4106 |
| Hindu calendars | |
| - Bikram Samwat | 401 – 402 |
| - Shaka Samvat | 267 – 268 |
| - Kali Yuga | 3446 – 3447 |
| Holocene calendar | 10345 |
| Iranian calendar | 277 BP – 276 BP |
| Islamic calendar | 286 BH – 285 BH |
| Japanese calendar | |
| Korean calendar | 2678 |
| Thai solar calendar | 888 |