|Centuries:||1st century BC – 1st century – 2nd century|
|Decades:||30s 40s 50s – 60s – 70s 80s 90s|
|Years:||63 64 65 – 66 – 67 68 69|
|66 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||819|
|Bahá'í calendar||−1778 – −1777|
|English Regnal year||N/A|
|Chinese calendar||乙丑年 (Wood Ox)
2762 or 2702
— to —
丙寅年 (Fire Tiger)
2763 or 2703
|Coptic calendar||−218 – −217|
|- Vikram Samvat||122–123|
|- Shaka Samvat||N/A|
|- Kali Yuga||3167–3168|
|Igbo calendar||−934 – −933|
|Iranian calendar||556 BP – 555 BP|
|Islamic calendar||573 BH – 572 BH|
|Minguo calendar||1846 before ROC
|Thai solar calendar||609|
|Wikimedia Commons has media related to 66.|
Year 66 (LXVI) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Telesinus and Paullinus (or, less frequently, year 819 Ab urbe condita). The denomination 66 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.
- September 22 – Emperor Nero creates the legion I Italica.
- The Jewish Revolt (66–70 AD) commences against the Roman Empire.
- The Zealots lay siege on Jerusalem and annihilate the Roman garrison (a cohort of Legio III).
- The Sicarii capture the fortress of Masada overlooking the Dead Sea.
- Cestius Gallus, legate of Syria, marches into Judea and leads a Roman army of 28,000 soldiers to put down the Jewish rebellion. Among the units are Legio III Gallica, Legio XII Fulminata and Legio XXII Primigenia.
- November – Gallus succeeds in conquering Beit She'arim "the new city", but is unable to take the Temple in Jerusalem. He retreats to the coast, but is surrounded at Beth-Horon and nearly wiped out by the Zealots.
- Gallus arrives in Caesarea, with six thousand men and numerous standards, including the eagle of Legio XII.
- The Roman Legion II Augusta is stationed at Gloucester.
- Suetonius Paullinus becomes a Roman Consul.
- The First Epistle to Timothy is written (approximate date).
Arts and sciences
- Dioscorides writes his De Materia Medica, a treatise on the methodical treatment of disease by use of medicine.
- Halley's Comet is visible.
- Petronius, Roman writer