1142
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1142 by topic | 
|---|
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Art and literature | 
| 1142 in poetry | 
| Gregorian calendar | 1142 MCXLII | 
| Ab urbe condita | 1895 | 
| Armenian calendar | 591 ԹՎ ՇՂԱ | 
| Assyrian calendar | 5892 | 
| Balinese saka calendar | 1063–1064 | 
| Bengali calendar | 548–549 | 
| Berber calendar | 2092 | 
| English Regnal year | 7 Ste. 1 – 8 Ste. 1 | 
| Buddhist calendar | 1686 | 
| Burmese calendar | 504 | 
| Byzantine calendar | 6650–6651 | 
| Chinese calendar | 辛酉年 (Metal Rooster) 3839 or 3632 — to — 壬戌年 (Water Dog) 3840 or 3633 | 
| Coptic calendar | 858–859 | 
| Discordian calendar | 2308 | 
| Ethiopian calendar | 1134–1135 | 
| Hebrew calendar | 4902–4903 | 
| Hindu calendars | |
| - Vikram Samvat | 1198–1199 | 
| - Shaka Samvat | 1063–1064 | 
| - Kali Yuga | 4242–4243 | 
| Holocene calendar | 11142 | 
| Igbo calendar | 142–143 | 
| Iranian calendar | 520–521 | 
| Islamic calendar | 536–537 | 
| Japanese calendar | Eiji (era) 2 / Kōji 1 (康治元年) | 
| Javanese calendar | 1048–1049 | 
| Julian calendar | 1142 MCXLII | 
| Korean calendar | 3475 | 
| Minguo calendar | 770 before ROC 民前770年 | 
| Nanakshahi calendar | −326 | 
| Seleucid era | 1453/1454 AG | 
| Thai solar calendar | 1684–1685 | 
| Tibetan calendar | 阴金鸡年 (female Iron-Rooster) 1268 or 887 or 115 — to — 阳水狗年 (male Water-Dog) 1269 or 888 or 116 | 
Year 1142 (MCXLII) was a common year starting on Thursday of the Julian calendar.