| Millennium: | 1st millennium |
|---|---|
| Centuries: | 1st century – 2nd century – 3rd century |
| Decades: | 110s 120s 130s – 140s – 150s 160s 170s |
| Years: | 137 138 139 – 140 – 141 142 143 |
| 140 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 140 CXL |
| Ab urbe condita | 893 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1704 – -1703 |
| Bengali calendar | -453 |
| Berber calendar | 1090 |
| Buddhist calendar | 684 |
| Burmese calendar | -498 |
| Byzantine calendar | 5648 – 5649 |
| Chinese calendar | 己卯年十一月廿四日 (2776/2836-11-24) — to —
庚辰年十二月初五日(2777/2837-12-5) |
| Coptic calendar | -144 – -143 |
| Ethiopian calendar | 132 – 133 |
| Hebrew calendar | 3900 – 3901 |
| Hindu calendars | |
| - Bikram Samwat | 196 – 197 |
| - Shaka Samvat | 62 – 63 |
| - Kali Yuga | 3241 – 3242 |
| Holocene calendar | 10140 |
| Iranian calendar | 482 BP – 481 BP |
| Islamic calendar | 497 BH – 496 BH |
| Japanese calendar | |
| Korean calendar | 2473 |
| Thai solar calendar | 683 |
Year 140 (CXL) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar.