| Millennium: | 2nd millennium | 
|---|---|
| Centuries: | |
| Decades: | |
| Years: | 
| 1138 by topic | |
| Leaders | |
| Political entities - State leaders - Religious leaders | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Art and literature | |
| 1138 in poetry | |
| Gregorian calendar | 1138 MCXXXVIII | 
| Ab urbe condita | 1891 | 
| Armenian calendar | 587 ԹՎ ՇՁԷ | 
| Assyrian calendar | 5888 | 
| Bengali calendar | 545 | 
| Berber calendar | 2088 | 
| English Regnal year | 3 Ste. 1 – 4 Ste. 1 | 
| Buddhist calendar | 1682 | 
| Burmese calendar | 500 | 
| Byzantine calendar | 6646–6647 | 
| Chinese calendar | 丁巳年 (Fire Snake) 3834 or 3774 — to — 戊午年 (Earth Horse) 3835 or 3775 | 
| Coptic calendar | 854–855 | 
| Discordian calendar | 2304 | 
| Ethiopian calendar | 1130–1131 | 
| Hebrew calendar | 4898–4899 | 
| Hindu calendars | |
| - Vikram Samvat | 1194–1195 | 
| - Shaka Samvat | 1059–1060 | 
| - Kali Yuga | 4238–4239 | 
| Holocene calendar | 11138 | 
| Igbo calendar | 138–139 | 
| Iranian calendar | 516–517 | 
| Islamic calendar | 532–533 | 
| Japanese calendar | Hōen 4 (保延4年) | 
| Javanese calendar | 1044–1045 | 
| Julian calendar | 1138 MCXXXVIII | 
| Korean calendar | 3471 | 
| Minguo calendar | 774 before ROC 民前774年 | 
| Nanakshahi calendar | −330 | 
| Seleucid era | 1449/1450 AG | 
| Thai solar calendar | 1680–1681 | 
Year 1138 (MCXXXVIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.