AD 1668
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | 16th century – 17th century – 18th century |
| Decades: | 1630s 1640s 1650s – 1660s – 1670s 1680s 1690s |
| Years: | 1665 1666 1667 – 1668 – 1669 1670 1671 |
| 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) 4364 or 4304 — to — 戊申年 (Earth Monkey) 4365 or 4305 |
| 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 7 (寛文７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.
Events
- January – The Triple Alliance of 1668 is formed.
- February 13 Lisbon – Peace Treaty between Afonso VI of Portugal and Carlos II of Spain, by mediation of Charles II of England where it is recognized the legitimity of the Portuguese monarch. Portugal yields Ceuta to Spain.
- The first Treaty of Aix-la-Chapelle ends the War of Devolution.
- Bishop Issac Barrow founds a trust to establish a university on the Isle of Man. (King William's College)
- July 25 – The magnitude 8.5 Shandong earthquake causes 43,000 to 50,000 deaths in Shandong during the Qing Dynasty, making it the largest historical earthquake in Eastern China.
- August 17 – The magnitude 8.0 North Anatolia earthquake causes 8,000 deaths in northern Anatolia, Ottoman Empire, and is the most powerful earthquake recorded in Turkey.
- First performance of Molière's comedy, Tartuffe
- The British East India Company takes over Bombay
- Foundation of the First National Bank of Europe in Stockholm, Sweden "Riskbank"
- Emperor Yohannes I of Ethiopia convenes a church council in Gondar, which decides to expel all Roman Catholics in Ethiopia.