|Centuries:||6th century – 7th century – 8th century|
|Decades:||630s 640s 650s – 660s – 670s 680s 690s|
|Years:||657 658 659 – 660 – 661 662 663|
|660 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1413|
|Bahá'í calendar||−1184 – −1183|
|English Regnal year||N/A|
|Chinese calendar||己未年 (Earth Goat)
3356 or 3296
— to —
庚申年 (Metal Monkey)
3357 or 3297
|- Vikram Samvat||716–717|
|- Shaka Samvat||582–583|
|- Kali Yuga||3761–3762|
|Igbo calendar||−340 – −339|
|Minguo calendar||1252 before ROC
|Thai solar calendar||1203|
|Wikimedia Commons has media related to 660.|
Year 660 (DCLX) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar. The denomination 660 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.
- Emperor Constans II is paranoid about the ambitions of his younger brother, Theodosius, and has him murdered. Having attracted the hatred of the citizens of Constantinople, Constans decides to leave the Byzantine capital and moves to Syracuse (Sicily).
- The March of the Slavs, centred north of modern Klagenfurt, preserves independence and is first mentioned in historical sources, known as Carantania (Austria).
- Felix, patrician of Toulouse, assumes the titles of Duke of Vasconia and Aquitaine. He is formally a vassal of the Franks but rules independent as de facto.
- King Cenwalh of Wessex becomes dissatisfied with his local bishop, Agilbert of Dorchester, as he does not speak West-Saxon. Cenwalh splits the episcopal see of Wessex in two. Wine becomes the first bishop of Winchester, by the Saxons called Wintancestir. Agilbert resigns in protest and travels north to Northumbria.
- King Sigeberht II of Essex is murdered by his brothers, Swithelm and Swithfrith, and other kinsmen for being "too ready to pardon his enemies" that is to say, the Christians. Swithelm becomes king of Essex, with Swithfrith as joint-monarch for a periode (approximate date).
- King Conall Crandomna of Dál Riata (modern Scotland) dies and is succeeded by his nephew Domangart mac Domnaill.
- July 9 – Battle of Hwangsanbeol: Sillan forces (50,000 men) led by general Kim Yu-shin defeat the army of Baekje at Nonsan. During the fightings general Gyebaek dies against the Sillan invaders.
- Baekje in southwestern Korea is conquered by an alliance of the Tang Dynasty and Silla, led by general Su Dingfang and king Munmu of Silla. The Japanese envoys detained in Chang'an are paroled.
- Emperor Gao Zong suffers from an illness (possibly slow-poisoning). His wife Wu Zetian starts to rule the Chinese Empire.
- Prince Naka no Ōe no Ōji of Japan for the first time makes a clepsydra at Asuka, by which he causes the people to know the hours.
- Acca, bishop of Hexham (approximate date)
- Genmei, empress of Japan (d. 721)
- John of Dailam, Syrian monk (d. 738)
- Leudwinus, Frankish bishop (approximate date)
- Rupert, bishop of Salzburg (approximate date)
- Yamanoue no Okura, Japanese poet (d. 733)
- Boggis, Duke of Aquitaine (approximate date)
- Conall Crandomna, king of Dál Riata (Scotland)
- December 1 – Eligius, bishop and saint
- Gyebaek, general of Baekje (Korea)
- Magnus, bishop and governor of Avignon
- Sigebert III, king of Austrasia (or 656)
- Sigeberht II, king of Essex (approximate date)
- Xin Maojiang, chancellor of the Tang Dynasty
- Lewis, Miracula, p. 388
- Bede, Book III, chapter 7