| Millennium: | 1st millennium |
|---|---|
| Centuries: | 9th century – 10th century – 11th century |
| Decades: | 910s 920s 930s – 940s – 950s 960s 970s |
| Years: | 937 938 939 – 940 – 941 942 943 |
| 940 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 940 CMXL |
| Ab urbe condita | 1693 |
| Armenian calendar | 389 ԹՎ ՅՁԹ |
| Assyrian calendar | 5690 |
| Bahá'í calendar | -904–-903 |
| Bengali calendar | 347 |
| Berber calendar | 1890 |
| English Regnal year | N/A |
| Buddhist calendar | 1484 |
| Burmese calendar | 302 |
| Byzantine calendar | 6448–6449 |
| Chinese calendar | 己亥年十一月十九日 (3576/3636-11-19) — to —
庚子年十一月三十日(3577/3637-11-30) |
| Coptic calendar | 656–657 |
| Ethiopian calendar | 932–933 |
| Hebrew calendar | 4700–4701 |
| Hindu calendars | |
| - Vikram Samvat | 996–997 |
| - Shaka Samvat | 862–863 |
| - Kali Yuga | 4041–4042 |
| Holocene calendar | 10940 |
| Iranian calendar | 318–319 |
| Islamic calendar | 328–329 |
| Japanese calendar | |
| Korean calendar | 3273 |
| Minguo calendar | 972 before ROC 民前972年 |
| Thai solar calendar | 1483 |
Year 940 (CMXL) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar.