| 66 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 66 LXVI |
| Ab urbe condita | 819 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1778 – -1777 |
| Berber calendar | 1016 |
| Buddhist calendar | 610 |
| Burmese calendar | -572 |
| Byzantine calendar | 5574 – 5575 |
| Chinese calendar | 乙丑年十一月十六日 (2702/2762-11-16) — to —
丙寅年十一月廿六日(2703/2763-11-26) |
| Coptic calendar | -218 – -217 |
| Ethiopian calendar | 58 – 59 |
| Hebrew calendar | 3826 – 3827 |
| Hindu calendars | |
| - Vikram Samvat | 121 – 122 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3167 – 3168 |
| Holocene calendar | 10066 |
| Iranian calendar | 556 BP – 555 BP |
| Islamic calendar | 573 BH – 572 BH |
| Japanese calendar | |
| Korean calendar | 2399 |
| Thai solar calendar | 609 |
Year 66 was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.
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