1138
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1138 by topic | 
|---|
| 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 | 
| Balinese saka calendar | 1059–1060 | 
| Bengali calendar | 544–545 | 
| 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) 3835 or 3628 — to — 戊午年 (Earth Horse) 3836 or 3629 | 
| 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 | 
| Tibetan calendar | 阴火蛇年 (female Fire-Snake) 1264 or 883 or 111 — to — 阳土马年 (male Earth-Horse) 1265 or 884 or 112 | 
Year 1138 (MCXXXVIII) was a common year starting on Saturday of the Julian calendar.