Millennium:	1st millennium BC
Centuries:	8th century BC 7th century BC 6th century BC
Decades:	680s BC 670s BC 660s BC 650s BC 640s BC
Years:	669 BC 668 BC 667 BC 666 BC 665 BC 664 BC 663 BC

Politics
666 BC by topic
State leaders Political entities
Categories
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666 BC in various calendars
Gregorian calendar	666 BC DCLXVI BC
Ab urbe condita	88
Ancient Egypt era	XXV dynasty, 87
- Pharaoh	Taharqa, 25
Ancient Greek era	28th Olympiad, year 3
Assyrian calendar	4085
Balinese saka calendar	N/A
Bengali calendar	−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.^{[citation needed]}

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Births