| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 668 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 668 DCLXVIII |
| Ab urbe condita | 1421 |
| Armenian calendar | 117 ԹՎ ՃԺԷ |
| Assyrian calendar | 5418 |
| Balinese saka calendar | 589–590 |
| Bengali calendar | 75 |
| Berber calendar | 1618 |
| Buddhist calendar | 1212 |
| Burmese calendar | 30 |
| Byzantine calendar | 6176–6177 |
| Chinese calendar | 丁卯年 (Fire Rabbit) 3365 or 3158 — to — 戊辰年 (Earth Dragon) 3366 or 3159 |
| Coptic calendar | 384–385 |
| Discordian calendar | 1834 |
| Ethiopian calendar | 660–661 |
| Hebrew calendar | 4428–4429 |
| Hindu calendars | |
| - Vikram Samvat | 724–725 |
| - Shaka Samvat | 589–590 |
| - Kali Yuga | 3768–3769 |
| Holocene calendar | 10668 |
| Iranian calendar | 46–47 |
| Islamic calendar | 47–48 |
| Japanese calendar | Hakuchi 19 (白雉１９年) |
| Javanese calendar | 559–560 |
| Julian calendar | 668 DCLXVIII |
| Korean calendar | 3001 |
| Minguo calendar | 1244 before ROC 民前1244年 |
| Nanakshahi calendar | −800 |
| Seleucid era | 979/980 AG |
| Thai solar calendar | 1210–1211 |
| Tibetan calendar | 阴火兔年 (female Fire-Rabbit) 794 or 413 or −359 — to — 阳土龙年 (male Earth-Dragon) 795 or 414 or −358 |
Year 668 (DCLXVIII) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 668 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.