340 SM nyaéta taun ka-340 Saméméh Maséhi dina Kalénder Gregorian.
| Kalénder Gregorian | 340 SM |
| Ab urbe condita | 414 |
| Kalénder Arménia | N/A |
| Kalénder Cina | 2297/2357 ([[Daur séksagenari|]]年) — nepi ka — 2298/2358([[Daur séksagenari|]]年) |
| Kalénder Étiopia | -347 – -346 |
| Kalénder Yahudi | 3421 – 3422 |
| Kalénder Hindu | |
| - Vikram Samvat | -284 – -283 |
| - Shaka Samvat | N/A |
| Kalénder Iran | 961 BP – 960 BP |
| Kalénder Islam | 991 SH – 990 SH |
| Kalénder Jepang | |
| - Taun penjajahan | Kōki 321 (皇紀321年) |
| - Jaman Jōmon | 9661 |
| Kalénder panonpoé Thai | 204 |
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