|Centuries:||6th century – 7th century – 8th century|
|Decades:||640s 650s 660s – 670s – 680s 690s 700s|
|Years:||668 669 670 – 671 – 672 673 674|
|671 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1424|
|Chinese calendar||庚午年 (Metal Horse)
3367 or 3307
— to —
辛未年 (Metal Goat)
3368 or 3308
|- Vikram Samvat||727–728|
|- Shaka Samvat||593–594|
|- Kali Yuga||3772–3773|
|Minguo calendar||1241 before ROC
|Seleucid era||982/983 AG|
|Thai solar calendar||1213–1214|
|Wikimedia Commons has media related to 671.|
Year 671 (DCLXXI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. The denomination 671 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.
- Perctarit returns from exile and reclaims his realm, which is being ruled on behalf of Garibald after his father king Grimoald I has died. He deposes the young king and becomes the new ruler of the Lombard Kingdom in Italy. During his reign Perctarit makes Catholicism the official religion, but does not recognize papal authority.Grimoald is buried in the St. Ambrogio Church (Milan).
- Battle of Two Rivers: King Ecgfrith of Northumbria defeats the Picts under king Drest VI in the vicinity of Moncreiffe Island, near Perth (Scotland).After the battle the Picts are reduced to slavery and subject to the yoke of captivity for the next 14 years.
- Yijing, Chinese Buddhist monk, travels by boat from Guangzhou and visits the capital of the partly Buddhist kingdom of Srivijaya in Palembang (Indonesia). He stays for 6 months to study Sanskrit grammar and Malay language.
- June 10 – Emperor Tenji introduces a water clock (clepsydra) called Rokoku. The instrument, which measure time and indicates hours, is placed in the capital of Ōtsu in Japan.
- Silla seizes control of the former Baekje capital of Sabi from the Tang Protectorate General to Pacify the East.
- Sigebert IV, Frankish prince (approximate date)
- Brown, T. S. The New Cambridge Medieval History: II. c. 700 - c. 900. p. 321.
- Fraser, James E. (2006). "The Pictish Conquest", p.59
- Colgrave, Bertram (1927). "The Life of Bishop Wilfrid", Cambridge University. ISBN 978-0521-31387-2
- "Why is June 10 known as Time Memorial Day?". Seiko Institute of Horology. Retrieved 2012-04-17.