|669 by topic|
|Ab urbe condita||1422|
|Balinese saka calendar||590–591|
|Chinese calendar||戊辰年 (Earth Dragon)|
3365 or 3305
— to —
己巳年 (Earth Snake)
3366 or 3306
|- Vikram Samvat||725–726|
|- Shaka Samvat||590–591|
|- Kali Yuga||3769–3770|
|Minguo calendar||1243 before ROC|
|Seleucid era||980/981 AG|
|Thai solar calendar||1211–1212|
795 or 414 or −358
— to —
796 or 415 or −357
Year 669 (DCLXIX) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. The denomination 669 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.
- Spring – Arab forces that have taken Chalcedon, on the Asian shore of the Bosporus, threaten the Byzantine capital Constantinople. The Muslim-Arabs are decimated by famine and disease. Yazid, Arab commander, retreats to the island of Cyzicus (modern Turkey).
- King Ecgberht of Kent loses the overlordship of Surrey to King Wulfhere of Mercia. Ecgberht then grants the old Saxon Shore Fort at Reculver (south-east England) to a priest named Bassa, in order to establish a monastery dedicated to St. Mary (approximate date).
- November 14 – Kamatari, Japanese statesman and reformer, receives the surname Fujiwara from Emperor Tenji as a reward for his services, but dies in Yamato prefecture (modern-day Sakurai City).
- Gregory II, pope of the Catholic Church (d. 731)
- Justinian II, Byzantine emperor (approximate date)
- Qutayba ibn Muslim, Arab general (approximate date)
- November 14 – Fujiwara no Kamatari, founder of the Fujiwara clan (b. 614)
- December 31 – Li Shiji, general and chancellor of the Tang Dynasty (b. 594)
- Jaruman, bishop of Mercia (approximate date)
- Mezezius, Byzantine usurper (approximate date)
- Ponsonby-Fane, Richard (1962). "Sovereign and Subject", pp. 216–220