644
| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 644 DCXLIV |
| Ab urbe condita | 1397 |
| Armenian calendar | 93 ԹՎ ՂԳ |
| Assyrian calendar | 5394 |
| Bengali calendar | 51 |
| Berber calendar | 1594 |
| Buddhist calendar | 1188 |
| Burmese calendar | 6 |
| Byzantine calendar | 6152–6153 |
| Chinese calendar |
癸卯年 (Water Rabbit) 3340 or 3280 — to — 甲辰年 (Wood Dragon) 3341 or 3281 |
| Coptic calendar | 360–361 |
| Discordian calendar | 1810 |
| Ethiopian calendar | 636–637 |
| Hebrew calendar | 4404–4405 |
| Hindu calendars | |
| - Vikram Samvat | 700–701 |
| - Shaka Samvat | 565–566 |
| - Kali Yuga | 3744–3745 |
| Holocene calendar | 10644 |
| Iranian calendar | 22–23 |
| Islamic calendar | 23–24 |
| Japanese calendar | N/A |
| Javanese calendar | 535–536 |
| Julian calendar | 644 DCXLIV |
| Korean calendar | 2977 |
| Minguo calendar | 1268 before ROC 民前1268年 |
| Nanakshahi calendar | −824 |
| Seleucid era | 955/956 AG |
| Thai solar calendar | 1186–1187 |
Year 644 (DCXLIV) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar. The denomination 644 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.
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