| Millennium: | 2nd millennium |
|---|---|
| Centuries: | 11th century – 12th century – 13th century |
| Decades: | 1110s 1120s 1130s – 1140s – 1150s 1160s 1170s |
| Years: | 1137 1138 1139 – 1140 – 1141 1142 1143 |
| 1140 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Art and literature | |
| 1140 in poetry | |
| Gregorian calendar | 1140 MCXL |
| Ab urbe condita | 1893 |
| Armenian calendar | 589 ԹՎ ՇՁԹ |
| Assyrian calendar | 5890 |
| Bahá'í calendar | -704–-703 |
| Bengali calendar | 547 |
| Berber calendar | 2090 |
| English Regnal year | 5 Ste. 1 – 6 Ste. 1 |
| Buddhist calendar | 1684 |
| Burmese calendar | 502 |
| Byzantine calendar | 6648–6649 |
| Chinese calendar | 己未年十二月初十日 (3776/3836-12-10) — to —
庚申年十一月廿一日(3777/3837-11-21) |
| Coptic calendar | 856–857 |
| Ethiopian calendar | 1132–1133 |
| Hebrew calendar | 4900–4901 |
| Hindu calendars | |
| - Vikram Samvat | 1196–1197 |
| - Shaka Samvat | 1062–1063 |
| - Kali Yuga | 4241–4242 |
| Holocene calendar | 11140 |
| Iranian calendar | 518–519 |
| Islamic calendar | 534–535 |
| Japanese calendar | |
| Korean calendar | 3473 |
| Minguo calendar | 772 before ROC 民前772年 |
| Thai solar calendar | 1683 |
Year 1140 (MCXL) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar.