Year 662 (DCLXII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 662 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.
|Ab urbe condita||1415|
|Balinese saka calendar||583–584|
|Chinese calendar||辛酉年 (Metal Rooster)|
3358 or 3298
— to —
壬戌年 (Water Dog)
3359 or 3299
|- Vikram Samvat||718–719|
|- Shaka Samvat||583–584|
|- Kali Yuga||3762–3763|
|Minguo calendar||1250 before ROC|
|Seleucid era||973/974 AG|
|Thai solar calendar||1204–1205|
788 or 407 or −365
— to —
789 or 408 or −364
- King Godepert makes war against his brother Perctarit. He seeks the aid of Grimoald I, duke of Benevento, who has him assassinated; his son Raginpert escapes. Grimoald usurps the throne and becomes ruler of the Lombard Kingdom. Perctarit is exiled, and seeks refuge in Gaul and Britain.
- The Franks take advantage of the Lombard civil war and invade Northern Italy, but are defeated by Grimoald I. King Chlothar III gives Austrasia to his youngest brother Childeric II. He is raised on the shield of his warriors and proclaimed king of Austrasia.
- King Swithelm of Essex is converted to Christianity and baptised by Cedd, at the court of King Æthelwald of East Anglia, who acts as his sponsor. East Anglia may have held some sort of overlordship over Essex at this time (approximate date).
- Muslim Conquest: Arab forces of the Umayyad Caliphate resume the push to capture Persian lands, and begin to move towards the lands east and north of the plateau, towards Greater Khorasan (Iran) and the Silk Road along Transoxiana.
- Ziyad ibn Abi Sufyan, Muslim general and a member of the Umayyad clan, is appointed governor of Iraq (Basra) and the former Persian provinces (approximate date).
- June 22 – Rui Zong, emperor of the Tang Dynasty (d. 716)
- Ali al-Akbar ibn Husayn, Muslim martyr (b. 680)
- Kakinomoto no Hitomaro, Japanese poet (approximate date)
- Kusakabe, Japanese crown prince (d. 689)
- Odile of Alsace, Frankish abbess (approximate date)
- Rumwold of Buckingham, Anglo-Saxon prince and saint
- Patrick J. Geary, "Before France & Germany, the Creation & Transformation of the Merovingian World". (New York, Oxford: Oxford University Press, 1988), p. 180
- Kriti M. Shah, "The Pashtuns, the Taliban, and America’s Longest War", Asian Survey, Vol. 57, Number 6 (2017) pp. 981–1007