| Centuries: | 6th century · 7th century · 8th century |
| Decades: | 630s 640s 650s 660s 670s 680s 690s |
| Years: | 662 663 664 665 666 667 668 |
| 665 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 665 DCLXV |
| Ab urbe condita | 1418 |
| Armenian calendar | 114 ԹՎ ՃԺԴ |
| Bahá'í calendar | -1179 – -1178 |
| Bengali calendar | 72 |
| Berber calendar | 1615 |
| Buddhist calendar | 1209 |
| Burmese calendar | 27 |
| Byzantine calendar | 6173 – 6174 |
| Chinese calendar | 甲子年十二月初十日 (3301/3361-12-10) — to —
乙丑年十一月十九日(3302/3362-11-19) |
| Coptic calendar | 381 – 382 |
| Ethiopian calendar | 657 – 658 |
| Hebrew calendar | 4425 – 4426 |
| Hindu calendars | |
| - Bikram Samwat | 721 – 722 |
| - Shaka Samvat | 587 – 588 |
| - Kali Yuga | 3766 – 3767 |
| Holocene calendar | 10665 |
| Iranian calendar | 43 – 44 |
| Islamic calendar | 44 – 45 |
| Japanese calendar | |
| Korean calendar | 2998 |
| Thai solar calendar | 1208 |