| Millennium: | 1st millennium |
|---|---|
| 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 | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 671 DCLXXI |
| Ab urbe condita | 1424 |
| Armenian calendar | 120 ԹՎ ՃԻ |
| Bahá'í calendar | -1173 – -1172 |
| Bengali calendar | 78 |
| Berber calendar | 1621 |
| Buddhist calendar | 1215 |
| Burmese calendar | 33 |
| Byzantine calendar | 6179 – 6180 |
| Chinese calendar | 庚午年十一月十五日 (3307/3367-11-15) — to —
辛未年十一月廿五日(3308/3368-11-25) |
| Coptic calendar | 387 – 388 |
| Ethiopian calendar | 663 – 664 |
| Hebrew calendar | 4431 – 4432 |
| Hindu calendars | |
| - Bikram Samwat | 727 – 728 |
| - Shaka Samvat | 593 – 594 |
| - Kali Yuga | 3772 – 3773 |
| Holocene calendar | 10671 |
| Iranian calendar | 49 – 50 |
| Islamic calendar | 50 – 51 |
| Japanese calendar | |
| Korean calendar | 3004 |
| Thai solar calendar | 1214 |
671 was a year of the 7th century.