Back 1638 Abkhazian 1638 Afrikaans 1638 ALS 1638 እ.ኤ.አ. Amharic 1638 AN 1638 Arabic 1638 ARY 1638 ARZ 1638 AST 1638 AVK
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| Millennium: | 2nd millennium |
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| Years: |
| 1638 by topic |
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| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1638 MDCXXXVIII |
| Ab urbe condita | 2391 |
| Armenian calendar | 1087 ԹՎ ՌՁԷ |
| Assyrian calendar | 6388 |
| Balinese saka calendar | 1559–1560 |
| Bengali calendar | 1045 |
| Berber calendar | 2588 |
| English Regnal year | 13 Cha. 1 – 14 Cha. 1 |
| Buddhist calendar | 2182 |
| Burmese calendar | 1000 |
| Byzantine calendar | 7146–7147 |
| Chinese calendar | 丁丑年 (Fire Ox) 4335 or 4128 — to — 戊寅年 (Earth Tiger) 4336 or 4129 |
| Coptic calendar | 1354–1355 |
| Discordian calendar | 2804 |
| Ethiopian calendar | 1630–1631 |
| Hebrew calendar | 5398–5399 |
| Hindu calendars | |
| - Vikram Samvat | 1694–1695 |
| - Shaka Samvat | 1559–1560 |
| - Kali Yuga | 4738–4739 |
| Holocene calendar | 11638 |
| Igbo calendar | 638–639 |
| Iranian calendar | 1016–1017 |
| Islamic calendar | 1047–1048 |
| Japanese calendar | Kan'ei 15 (寛永１５年) |
| Javanese calendar | 1559–1560 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 3971 |
| Minguo calendar | 274 before ROC 民前274年 |
| Nanakshahi calendar | 170 |
| Thai solar calendar | 2180–2181 |
| Tibetan calendar | 阴火牛年 (female Fire-Ox) 1764 or 1383 or 611 — to — 阳土虎年 (male Earth-Tiger) 1765 or 1384 or 612 |
1638 (MDCXXXVIII) was a common year starting on Friday of the Gregorian calendar and a common year starting on Monday of the Julian calendar, the 1638th year of the Common Era (CE) and Anno Domini (AD) designations, the 638th year of the 2nd millennium, the 38th year of the 17th century, and the 9th year of the 1630s decade. As of the start of 1638, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.