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| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| AD 138 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 138 CXXXVIII |
| Ab urbe condita | 891 |
| Assyrian calendar | 4888 |
| Balinese saka calendar | 59–60 |
| Bengali calendar | −455 |
| Berber calendar | 1088 |
| Buddhist calendar | 682 |
| Burmese calendar | −500 |
| Byzantine calendar | 5646–5647 |
| Chinese calendar | 丁丑年 (Fire Ox) 2835 or 2628 — to — 戊寅年 (Earth Tiger) 2836 or 2629 |
| Coptic calendar | −146 – −145 |
| Discordian calendar | 1304 |
| Ethiopian calendar | 130–131 |
| Hebrew calendar | 3898–3899 |
| Hindu calendars | |
| - Vikram Samvat | 194–195 |
| - Shaka Samvat | 59–60 |
| - Kali Yuga | 3238–3239 |
| Holocene calendar | 10138 |
| Iranian calendar | 484 BP – 483 BP |
| Islamic calendar | 499 BH – 498 BH |
| Javanese calendar | 13–14 |
| Julian calendar | 138 CXXXVIII |
| Korean calendar | 2471 |
| Minguo calendar | 1774 before ROC 民前1774年 |
| Nanakshahi calendar | −1330 |
| Seleucid era | 449/450 AG |
| Thai solar calendar | 680–681 |
| Tibetan calendar | 阴火牛年 (female Fire-Ox) 264 or −117 or −889 — to — 阳土虎年 (male Earth-Tiger) 265 or −116 or −888 |
Year 138 (CXXXVIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Niger and Camerinus (or, less frequently, year 891 Ab urbe condita). The denomination 138 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.