| Millennium: | 2nd millennium |
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| Centuries: |
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| Decades: |
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| Years: |
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| 1138 by topic |
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| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Art and literature |
| 1138 in poetry |
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| Gregorian calendar | 1138 MCXXXVIII |
| Ab urbe condita | 1891 |
| Armenian calendar | 587 ԹՎ ՇՁԷ |
| Assyrian calendar | 5888 |
| Balinese saka calendar | 1059–1060 |
| 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) 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 | Hōen4 (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 (link will display the full calendar) of the Julian calendar.
