843
| Years | 
|---|
| Millennium | 
| 1st millennium | 
| Centuries | 
| Decades | 
| Years | 
| 843 by topic | 
|---|
| Leaders | 
| Categories | 
| 
 | 
| Gregorian calendar | 843 DCCCXLIII | 
| Ab urbe condita | 1596 | 
| Armenian calendar | 292 ԹՎ ՄՂԲ | 
| Assyrian calendar | 5593 | 
| Balinese saka calendar | 764–765 | 
| Bengali calendar | 249–250 | 
| Berber calendar | 1793 | 
| Buddhist calendar | 1387 | 
| Burmese calendar | 205 | 
| Byzantine calendar | 6351–6352 | 
| Chinese calendar | 壬戌年 (Water Dog) 3540 or 3333 — to — 癸亥年 (Water Pig) 3541 or 3334 | 
| Coptic calendar | 559–560 | 
| Discordian calendar | 2009 | 
| Ethiopian calendar | 835–836 | 
| Hebrew calendar | 4603–4604 | 
| Hindu calendars | |
| - Vikram Samvat | 899–900 | 
| - Shaka Samvat | 764–765 | 
| - Kali Yuga | 3943–3944 | 
| Holocene calendar | 10843 | 
| Iranian calendar | 221–222 | 
| Islamic calendar | 228–229 | 
| Japanese calendar | Jōwa 10 (承和10年) | 
| Javanese calendar | 740–741 | 
| Julian calendar | 843 DCCCXLIII | 
| Korean calendar | 3176 | 
| Minguo calendar | 1069 before ROC 民前1069年 | 
| Nanakshahi calendar | −625 | 
| Seleucid era | 1154/1155 AG | 
| Thai solar calendar | 1385–1386 | 
| Tibetan calendar | 阳水狗年 (male Water-Dog) 969 or 588 or −184 — to — 阴水猪年 (female Water-Pig) 970 or 589 or −183 | 
Year 843 (DCCCXLIII) was a common year starting on Monday of the Julian calendar.