| Centuries: | 6th century · 7th century · 8th century |
| Decades: | 630s 640s 650s 660s 670s 680s 690s |
| Years: | 658 659 660 661 662 663 664 |
| 661 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 661 DCLXI |
| Ab urbe condita | 1414 |
| Armenian calendar | 110 ԹՎ ՃԺ |
| Bahá'í calendar | -1183 – -1182 |
| Berber calendar | 1611 |
| Buddhist calendar | 1205 |
| Burmese calendar | 23 |
| Chinese calendar | 3297/3357-11-25 (庚申年十一月廿五日) — to —
3298/3358-12-5(辛酉年十二月初五日) |
| Coptic calendar | 377 – 378 |
| Ethiopian calendar | 653 – 654 |
| Hebrew calendar | 4421 – 4422 |
| Hindu calendars | |
| - Vikram Samvat | 716 – 717 |
| - Shaka Samvat | 583 – 584 |
| - Kali Yuga | 3762 – 3763 |
| Holocene calendar | 10661 |
| Iranian calendar | 39 – 40 |
| Islamic calendar | 40 – 41 |
| Japanese calendar | |
| Korean calendar | 2994 |
| Thai solar calendar | 1204 |