| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 634 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 634 DCXXXIV |
| Ab urbe condita | 1387 |
| Armenian calendar | 83 ԹՎ ՁԳ |
| Assyrian calendar | 5384 |
| Balinese saka calendar | 555–556 |
| Bengali calendar | 41 |
| Berber calendar | 1584 |
| Buddhist calendar | 1178 |
| Burmese calendar | −4 |
| Byzantine calendar | 6142–6143 |
| Chinese calendar | 癸巳年 (Water Snake) 3331 or 3124 — to — 甲午年 (Wood Horse) 3332 or 3125 |
| Coptic calendar | 350–351 |
| Discordian calendar | 1800 |
| Ethiopian calendar | 626–627 |
| Hebrew calendar | 4394–4395 |
| Hindu calendars | |
| - Vikram Samvat | 690–691 |
| - Shaka Samvat | 555–556 |
| - Kali Yuga | 3734–3735 |
| Holocene calendar | 10634 |
| Iranian calendar | 12–13 |
| Islamic calendar | 12–13 |
| Japanese calendar | N/A |
| Javanese calendar | 524–525 |
| Julian calendar | 634 DCXXXIV |
| Korean calendar | 2967 |
| Minguo calendar | 1278 before ROC 民前1278年 |
| Nanakshahi calendar | −834 |
| Seleucid era | 945/946 AG |
| Thai solar calendar | 1176–1177 |
| Tibetan calendar | 阴水蛇年 (female Water-Snake) 760 or 379 or −393 — to — 阳木马年 (male Wood-Horse) 761 or 380 or −392 |
Year 634 (DCXXXIV) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 634 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.