818
| Years | 
|---|
| Millennium | 
| 1st millennium | 
| Centuries | 
| Decades | 
| Years | 
| 818 by topic | 
|---|
| Leaders | 
| Categories | 
| 
 | 
| Gregorian calendar | 818 DCCCXVIII | 
| Ab urbe condita | 1571 | 
| Armenian calendar | 267 ԹՎ ՄԿԷ | 
| Assyrian calendar | 5568 | 
| Balinese saka calendar | 739–740 | 
| Bengali calendar | 224–225 | 
| Berber calendar | 1768 | 
| Buddhist calendar | 1362 | 
| Burmese calendar | 180 | 
| Byzantine calendar | 6326–6327 | 
| Chinese calendar | 丁酉年 (Fire Rooster) 3515 or 3308 — to — 戊戌年 (Earth Dog) 3516 or 3309 | 
| Coptic calendar | 534–535 | 
| Discordian calendar | 1984 | 
| Ethiopian calendar | 810–811 | 
| Hebrew calendar | 4578–4579 | 
| Hindu calendars | |
| - Vikram Samvat | 874–875 | 
| - Shaka Samvat | 739–740 | 
| - Kali Yuga | 3918–3919 | 
| Holocene calendar | 10818 | 
| Iranian calendar | 196–197 | 
| Islamic calendar | 202–203 | 
| Japanese calendar | Kōnin 9 (弘仁9年) | 
| Javanese calendar | 714–715 | 
| Julian calendar | 818 DCCCXVIII | 
| Korean calendar | 3151 | 
| Minguo calendar | 1094 before ROC 民前1094年 | 
| Nanakshahi calendar | −650 | 
| Seleucid era | 1129/1130 AG | 
| Thai solar calendar | 1360–1361 | 
| Tibetan calendar | 阴火鸡年 (female Fire-Rooster) 944 or 563 or −209 — to — 阳土狗年 (male Earth-Dog) 945 or 564 or −208 | 
Year 818 (DCCCXVIII) was a common year starting on Friday of the Julian calendar.