| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| Gregorian calendar | 834 DCCCXXXIV |
| Ab urbe condita | 1587 |
| Armenian calendar | 283 ԹՎ ՄՁԳ |
| Assyrian calendar | 5584 |
| Bengali calendar | 241 |
| Berber calendar | 1784 |
| Buddhist calendar | 1378 |
| Burmese calendar | 196 |
| Byzantine calendar | 6342–6343 |
| Chinese calendar |
癸丑年 (Water Ox) 3530 or 3470 — to — 甲寅年 (Wood Tiger) 3531 or 3471 |
| Coptic calendar | 550–551 |
| Discordian calendar | 2000 |
| Ethiopian calendar | 826–827 |
| Hebrew calendar | 4594–4595 |
| Hindu calendars | |
| - Vikram Samvat | 890–891 |
| - Shaka Samvat | 755–756 |
| - Kali Yuga | 3934–3935 |
| Holocene calendar | 10834 |
| Iranian calendar | 212–213 |
| Islamic calendar | 218–219 |
| Japanese calendar |
Tenchō 11 / Jōwa 1 (承和元年) |
| Javanese calendar | 730–731 |
| Julian calendar | 834 DCCCXXXIV |
| Korean calendar | 3167 |
| Minguo calendar | 1078 before ROC 民前1078年 |
| Nanakshahi calendar | −634 |
| Seleucid era | 1145/1146 AG |
| Thai solar calendar | 1376–1377 |
Year 834 (DCCCXXXIV) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.