1242
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1242 by topic | 
|---|
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Art and literature | 
| 1242 in poetry | 
| Gregorian calendar | 1242 MCCXLII | 
| Ab urbe condita | 1995 | 
| Armenian calendar | 691 ԹՎ ՈՂԱ | 
| Assyrian calendar | 5992 | 
| Balinese saka calendar | 1163–1164 | 
| Bengali calendar | 648–649 | 
| Berber calendar | 2192 | 
| English Regnal year | 26 Hen. 3 – 27 Hen. 3 | 
| Buddhist calendar | 1786 | 
| Burmese calendar | 604 | 
| Byzantine calendar | 6750–6751 | 
| Chinese calendar | 辛丑年 (Metal Ox) 3939 or 3732 — to — 壬寅年 (Water Tiger) 3940 or 3733 | 
| Coptic calendar | 958–959 | 
| Discordian calendar | 2408 | 
| Ethiopian calendar | 1234–1235 | 
| Hebrew calendar | 5002–5003 | 
| Hindu calendars | |
| - Vikram Samvat | 1298–1299 | 
| - Shaka Samvat | 1163–1164 | 
| - Kali Yuga | 4342–4343 | 
| Holocene calendar | 11242 | 
| Igbo calendar | 242–243 | 
| Iranian calendar | 620–621 | 
| Islamic calendar | 639–640 | 
| Japanese calendar | Ninji 3 (仁治3年) | 
| Javanese calendar | 1151–1152 | 
| Julian calendar | 1242 MCCXLII | 
| Korean calendar | 3575 | 
| Minguo calendar | 670 before ROC 民前670年 | 
| Nanakshahi calendar | −226 | 
| Thai solar calendar | 1784–1785 | 
| Tibetan calendar | 阴金牛年 (female Iron-Ox) 1368 or 987 or 215 — to — 阳水虎年 (male Water-Tiger) 1369 or 988 or 216 | 
Year 1242 (MCCXLII) was a common year starting on Wednesday of the Julian calendar.