| Millennium: | 2nd millennium | 
|---|---|
| Centuries: | |
| Decades: | |
| Years: | 
| 1257 by topic | |
| Leaders | |
| Political entities - State leaders - Religious leaders | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Art and literature | |
| 1257 in poetry | |
| Gregorian calendar | 1257 MCCLVII | 
| Ab urbe condita | 2010 | 
| Armenian calendar | 706 ԹՎ ՉԶ | 
| Assyrian calendar | 6007 | 
| Bengali calendar | 664 | 
| Berber calendar | 2207 | 
| English Regnal year | 41 Hen. 3 – 42 Hen. 3 | 
| Buddhist calendar | 1801 | 
| Burmese calendar | 619 | 
| Byzantine calendar | 6765–6766 | 
| Chinese calendar | 丙辰年 (Fire Dragon) 3953 or 3893 — to — 丁巳年 (Fire Snake) 3954 or 3894 | 
| Coptic calendar | 973–974 | 
| Discordian calendar | 2423 | 
| Ethiopian calendar | 1249–1250 | 
| Hebrew calendar | 5017–5018 | 
| Hindu calendars | |
| - Vikram Samvat | 1313–1314 | 
| - Shaka Samvat | 1178–1179 | 
| - Kali Yuga | 4357–4358 | 
| Holocene calendar | 11257 | 
| Igbo calendar | 257–258 | 
| Iranian calendar | 635–636 | 
| Islamic calendar | 654–655 | 
| Japanese calendar | Kōgen 2 / Shōka 1 (正嘉元年) | 
| Javanese calendar | 1166–1167 | 
| Julian calendar | 1257 MCCLVII | 
| Korean calendar | 3590 | 
| Minguo calendar | 655 before ROC 民前655年 | 
| Nanakshahi calendar | −211 | 
| Thai solar calendar | 1799–1800 | 
Year 1257 (MCCLVII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar.