| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 661 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 661 DCLXI |
| Ab urbe condita | 1414 |
| Armenian calendar | 110 ԹՎ ՃԺ |
| Assyrian calendar | 5411 |
| Balinese saka calendar | 582–583 |
| Bengali calendar | 68 |
| Berber calendar | 1611 |
| Buddhist calendar | 1205 |
| Burmese calendar | 23 |
| Byzantine calendar | 6169–6170 |
| Chinese calendar | 庚申年 (Metal Monkey) 3358 or 3151 — to — 辛酉年 (Metal Rooster) 3359 or 3152 |
| Coptic calendar | 377–378 |
| Discordian calendar | 1827 |
| Ethiopian calendar | 653–654 |
| Hebrew calendar | 4421–4422 |
| Hindu calendars | |
| - Vikram Samvat | 717–718 |
| - Shaka Samvat | 582–583 |
| - Kali Yuga | 3761–3762 |
| Holocene calendar | 10661 |
| Iranian calendar | 39–40 |
| Islamic calendar | 40–41 |
| Japanese calendar | Hakuchi 12 (白雉１２年) |
| Javanese calendar | 552–553 |
| Julian calendar | 661 DCLXI |
| Korean calendar | 2994 |
| Minguo calendar | 1251 before ROC 民前1251年 |
| Nanakshahi calendar | −807 |
| Seleucid era | 972/973 AG |
| Thai solar calendar | 1203–1204 |
| Tibetan calendar | 阳金猴年 (male Iron-Monkey) 787 or 406 or −366 — to — 阴金鸡年 (female Iron-Rooster) 788 or 407 or −365 |
Expansion under Muhammad, 622–632
Expansion during the Rashidun Caliphate, 632–661
Expansion during the Umayyad Caliphate, 661–750
Year 661 (DCLXI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 661 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.