|Centuries:||1st century – 2nd century – 3rd century|
|Decades:||90s 100s 110s – 120s – 130s 140s 150s|
|Years:||119 120 121 – 122 – 123 124 125|
|122 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||875|
|Chinese calendar||辛酉年 (Metal Rooster)
2818 or 2758
— to —
壬戌年 (Water Dog)
2819 or 2759
|Coptic calendar||−162 – −161|
|- Vikram Samvat||178–179|
|- Shaka Samvat||44–45|
|- Kali Yuga||3223–3224|
|Iranian calendar||500 BP – 499 BP|
|Islamic calendar||515 BH – 514 BH|
|Minguo calendar||1790 before ROC
|Seleucid era||433/434 AG|
|Thai solar calendar||664–665|
Year 122 (CXXII) 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 Aviola and Neratius (or, less frequently, year 875 Ab urbe condita). The denomination 122 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.
- Emperor Hadrian orders that a 73-mile (117-kilometer) wall be built to mark the northern Roman Empire while personally visiting the area. Hadrian's Wall, as it comes to be known, is intended to keep the Caledonians, Picts and other tribes at bay.
- Vindolanda a Roman auxiliary fort (castrum) in northern England is garrisoned by cohort VIIII Batavorum.
- September 13 – The building of Hadrian's Wall begins.
- Hadrian gives up the territories conquered in Scotland.
- Change of era name from Jianguang (2nd year) to Yanguang of the Chinese Eastern Han Dynasty.