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| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1644 by topic |
|---|
| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1644 MDCXLIV |
| Ab urbe condita | 2397 |
| Armenian calendar | 1093 ԹՎ ՌՂԳ |
| Assyrian calendar | 6394 |
| Balinese saka calendar | 1565–1566 |
| Bengali calendar | 1051 |
| Berber calendar | 2594 |
| English Regnal year | 19 Cha. 1 – 20 Cha. 1 |
| Buddhist calendar | 2188 |
| Burmese calendar | 1006 |
| Byzantine calendar | 7152–7153 |
| Chinese calendar | 癸未年 (Water Goat) 4341 or 4134 — to — 甲申年 (Wood Monkey) 4342 or 4135 |
| Coptic calendar | 1360–1361 |
| Discordian calendar | 2810 |
| Ethiopian calendar | 1636–1637 |
| Hebrew calendar | 5404–5405 |
| Hindu calendars | |
| - Vikram Samvat | 1700–1701 |
| - Shaka Samvat | 1565–1566 |
| - Kali Yuga | 4744–4745 |
| Holocene calendar | 11644 |
| Igbo calendar | 644–645 |
| Iranian calendar | 1022–1023 |
| Islamic calendar | 1053–1054 |
| Japanese calendar | Kan'ei 21 / Shōhō 1 (正保元年) |
| Javanese calendar | 1565–1566 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 3977 |
| Minguo calendar | 268 before ROC 民前268年 |
| Nanakshahi calendar | 176 |
| Thai solar calendar | 2186–2187 |
| Tibetan calendar | 阴水羊年 (female Water-Goat) 1770 or 1389 or 617 — to — 阳木猴年 (male Wood-Monkey) 1771 or 1390 or 618 |
1644 (MDCXLIV) was a leap year starting on Friday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1644th year of the Common Era (CE) and Anno Domini (AD) designations, the 644th year of the 2nd millennium, the 44th year of the 17th century, and the 5th year of the 1640s decade. As of the start of 1644, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
It is one of eight years (CE) to contain each Roman numeral once (1000(M)+500(D)+100(C)+(-10(X)+50(L))+(-1(I)+5(V)) = 1644).