| Millennium: | 1st millennium |
|---|---|
| Centuries: | 6th century – 7th century – 8th century |
| Decades: | 600s 610s 620s – 630s – 640s 650s 660s |
| Years: | 634 635 636 – 637 – 638 639 640 |
| 637 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 637 DCXXXVII |
| Ab urbe condita | 1390 |
| Armenian calendar | 86 ԹՎ ՁԶ |
| Assyrian calendar | 5387 |
| Bahá'í calendar | -1207–-1206 |
| Bengali calendar | 44 |
| Berber calendar | 1587 |
| English Regnal year | N/A |
| Buddhist calendar | 1181 |
| Burmese calendar | -1 |
| Byzantine calendar | 6145–6146 |
| Chinese calendar | 丙申年十一月三十日 (3273/3333-11-30) — to —
丁酉年十二月初十日(3274/3334-12-10) |
| Coptic calendar | 353–354 |
| Ethiopian calendar | 629–630 |
| Hebrew calendar | 4397–4398 |
| Hindu calendars | |
| - Vikram Samvat | 693–694 |
| - Shaka Samvat | 559–560 |
| - Kali Yuga | 3738–3739 |
| Holocene calendar | 10637 |
| Iranian calendar | 15–16 |
| Islamic calendar | 15–16 |
| Japanese calendar | |
| Korean calendar | 2970 |
| Minguo calendar | 1275 before ROC 民前1275年 |
| Thai solar calendar | 1180 |
Year 637 (DCXXXVII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. The denomination 637 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.