| Millennium: | 2nd millennium |
| Centuries: | 13th century – 14th century – 15th century |
| Decades: | 1310s 1320s 1330s – 1340s – 1350s 1360s 1370s |
| Years: | 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
The 1340s decade ran from January 1, 1340, to December 31, 1349.