| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 2nd century BC – 1st century BC – 1st century |
| Decades: | 90s BC 80s BC 70s BC – 60s BC – 50s BC 40s BC 30s BC |
| Years: | 69 BC 68 BC 67 BC – 66 BC – 65 BC 64 BC 63 BC |
| 66 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 66 BC |
| Ab urbe condita | 688 |
| Armenian calendar | N/A |
| Assyrian calendar | 4685 |
| Bahá'í calendar | -1909–-1908 |
| Bengali calendar | -658 |
| Berber calendar | 885 |
| English Regnal year | N/A |
| Buddhist calendar | 479 |
| Burmese calendar | -703 |
| Byzantine calendar | 5443–5444 |
| Chinese calendar | 甲寅年 (2571/2631) — to —
乙卯年(2572/2632) |
| Coptic calendar | -349–-348 |
| Ethiopian calendar | -73–-72 |
| Hebrew calendar | 3695–3696 |
| Hindu calendars | |
| - Vikram Samvat | -9–-8 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3036–3037 |
| Holocene calendar | 9935 |
| Iranian calendar | 687 BP – 686 BP |
| Islamic calendar | 708 BH – 707 BH |
| Japanese calendar | |
| Korean calendar | 2268 |
| Minguo calendar | 1977 before ROC 民前1977年 |
| Thai solar calendar | 478 |
| Wikimedia Commons has media related to: 66 BC |
Year 66 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Lepidus and Tullus (or, less frequently, year 688 Ab urbe condita). The denomination 66 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.
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