Year 667 (DCLXVII) was a common year starting on Friday of the Julian calendar. The denomination 667 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.

• Arab–Byzantine War: Caliph Muawiyah I launches a series of attacks against Byzantine holdings in Africa, Sicily and the East.^[1]

• The Lombards, under King Grimoald I, destroy Oderzo (Northern Italy). Much of its population flees to the nearby city of Heraclea.

• King Javanshir of Caucasian Albania (modern Azerbaijan) revolts against the Muslim-Arabs, but is defeated (approximate date).

• Wighard, archbishop of Canterbury, dies of the bubonic plague while returning from his consecration in Rome.^[2]
• The Abbey of St. Vaast in Arras (France) is founded.

• Hisham ibn Urwah, prominent narrator of hadith and scholar
• Qasim ibn Hasan, son of Hassan ibn Ali

• January 23 – Ildefonsus, bishop of Toledo
• Daoxuan, Chinese Buddhist monk (b. 596)
• Severus Sebokht, Syrian scholar and bishop
• Su Dingfang, general of the Tang dynasty (b. 591)
• Wighard, archbishop of Canterbury (approximate date)