| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 637 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 637 DCXXXVII |
| Ab urbe condita | 1390 |
| Armenian calendar | 86 ԹՎ ՁԶ |
| Assyrian calendar | 5387 |
| Balinese saka calendar | 558–559 |
| Bengali calendar | 44 |
| Berber calendar | 1587 |
| Buddhist calendar | 1181 |
| Burmese calendar | −1 |
| Byzantine calendar | 6145–6146 |
| Chinese calendar | 丙申年 (Fire Monkey) 3334 or 3127 — to — 丁酉年 (Fire Rooster) 3335 or 3128 |
| Coptic calendar | 353–354 |
| Discordian calendar | 1803 |
| Ethiopian calendar | 629–630 |
| Hebrew calendar | 4397–4398 |
| Hindu calendars | |
| - Vikram Samvat | 693–694 |
| - Shaka Samvat | 558–559 |
| - Kali Yuga | 3737–3738 |
| Holocene calendar | 10637 |
| Iranian calendar | 15–16 |
| Islamic calendar | 15–16 |
| Japanese calendar | N/A |
| Javanese calendar | 527–528 |
| Julian calendar | 637 DCXXXVII |
| Korean calendar | 2970 |
| Minguo calendar | 1275 before ROC 民前1275年 |
| Nanakshahi calendar | −831 |
| Seleucid era | 948/949 AG |
| Thai solar calendar | 1179–1180 |
| Tibetan calendar | 阳火猴年 (male Fire-Monkey) 763 or 382 or −390 — to — 阴火鸡年 (female Fire-Rooster) 764 or 383 or −389 |
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.