| Centuries: | 6th century · 7th century · 8th century |
| Decades: | 620s 630s 640s 650s 660s 670s 680s |
| Years: | 648 649 650 651 652 653 654 |
| 651 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 651 DCLI |
| Ab urbe condita | 1404 |
| Armenian calendar | 100 ԹՎ Ճ |
| Bahá'í calendar | -1193 – -1192 |
| Bengali calendar | 58 |
| Berber calendar | 1601 |
| Buddhist calendar | 1195 |
| Burmese calendar | 13 |
| Byzantine calendar | 6159 – 6160 |
| Chinese calendar | 庚戌年十二月初四日 (3287/3347-12-4) — to —
辛亥年十一月十四日(3288/3348-11-14) |
| Coptic calendar | 367 – 368 |
| Ethiopian calendar | 643 – 644 |
| Hebrew calendar | 4411 – 4412 |
| Hindu calendars | |
| - Bikram Samwat | 707 – 708 |
| - Shaka Samvat | 573 – 574 |
| - Kali Yuga | 3752 – 3753 |
| Holocene calendar | 10651 |
| Iranian calendar | 29 – 30 |
| Islamic calendar | 30 – 31 |
| Japanese calendar | |
| Korean calendar | 2984 |
| Thai solar calendar | 1194 |