| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
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| 1668 by topic |
|---|
| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1668 MDCLXVIII |
| Ab urbe condita | 2421 |
| Armenian calendar | 1117 ԹՎ ՌՃԺԷ |
| Assyrian calendar | 6418 |
| Balinese saka calendar | 1589–1590 |
| Bengali calendar | 1075 |
| Berber calendar | 2618 |
| English Regnal year | 19 Cha. 2 – 20 Cha. 2 |
| Buddhist calendar | 2212 |
| Burmese calendar | 1030 |
| Byzantine calendar | 7176–7177 |
| Chinese calendar | 丁未年 (Fire Goat) 4365 or 4158 — to — 戊申年 (Earth Monkey) 4366 or 4159 |
| Coptic calendar | 1384–1385 |
| Discordian calendar | 2834 |
| Ethiopian calendar | 1660–1661 |
| Hebrew calendar | 5428–5429 |
| Hindu calendars | |
| - Vikram Samvat | 1724–1725 |
| - Shaka Samvat | 1589–1590 |
| - Kali Yuga | 4768–4769 |
| Holocene calendar | 11668 |
| Igbo calendar | 668–669 |
| Iranian calendar | 1046–1047 |
| Islamic calendar | 1078–1079 |
| Japanese calendar | Kanbun 8 (寛文８年) |
| Javanese calendar | 1590–1591 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 4001 |
| Minguo calendar | 244 before ROC 民前244年 |
| Nanakshahi calendar | 200 |
| Thai solar calendar | 2210–2211 |
| Tibetan calendar | 阴火羊年 (female Fire-Goat) 1794 or 1413 or 641 — to — 阳土猴年 (male Earth-Monkey) 1795 or 1414 or 642 |
1668 (MDCLXVIII) was a leap year starting on Sunday of the Gregorian calendar and a leap year starting on Wednesday of the Julian calendar, the 1668th year of the Common Era (CE) and Anno Domini (AD) designations, the 668th year of the 2nd millennium, the 68th year of the 17th century, and the 9th year of the 1660s decade. As of the start of 1668, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.