666 BC
| Years |
|---|
| Millennium |
| 1st millennium BC |
| Centuries |
| Decades |
| Years |
| 666 BC by topic |
| Politics |
|---|
| Categories |
| Gregorian calendar | 666 BC DCLXVI BC |
| Ab urbe condita | 88 |
| Ancient Egypt era | XXV dynasty, 87 |
| - Pharaoh | Taharqa, 25 |
| Ancient Greek Olympiad (summer) | 28th Olympiad, year 3 |
| Assyrian calendar | 4085 |
| Balinese saka calendar | N/A |
| Bengali calendar | −1259 – −1258 |
| Berber calendar | 285 |
| Buddhist calendar | −121 |
| Burmese calendar | −1303 |
| Byzantine calendar | 4843–4844 |
| Chinese calendar | 甲寅年 (Wood Tiger) 2032 or 1825 — to — 乙卯年 (Wood Rabbit) 2033 or 1826 |
| Coptic calendar | −949 – −948 |
| Discordian calendar | 501 |
| Ethiopian calendar | −673 – −672 |
| Hebrew calendar | 3095–3096 |
| Hindu calendars | |
| - Vikram Samvat | −609 – −608 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2435–2436 |
| Holocene calendar | 9335 |
| Iranian calendar | 1287 BP – 1286 BP |
| Islamic calendar | 1327 BH – 1326 BH |
| Javanese calendar | N/A |
| Julian calendar | N/A |
| Korean calendar | 1668 |
| Minguo calendar | 2577 before ROC 民前2577年 |
| Nanakshahi calendar | −2133 |
| Thai solar calendar | −123 – −122 |
| Tibetan calendar | 阳木虎年 (male Wood-Tiger) −539 or −920 or −1692 — to — 阴木兔年 (female Wood-Rabbit) −538 or −919 or −1691 |
The year 666 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 88 Ab urbe condita . The denomination 666 BC 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.