|Centuries:||1st century – 2nd century – 3rd century|
|Decades:||90s 100s 110s – 120s – 130s 140s 150s|
|Years:||125 126 127 – 128 – 129 130 131|
|128 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||881|
|Chinese calendar||丁卯年 (Fire Rabbit)
2824 or 2764
— to —
戊辰年 (Earth Dragon)
2825 or 2765
|Coptic calendar||−156 – −155|
|- Vikram Samvat||184–185|
|- Shaka Samvat||50–51|
|- Kali Yuga||3229–3230|
|Iranian calendar||494 BP – 493 BP|
|Islamic calendar||509 BH – 508 BH|
|Minguo calendar||1784 before ROC
|Seleucid era||439/440 AG|
|Thai solar calendar||670–671|
Year 128 (CXXVIII) was a leap 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 Calpurnius and Libo (or, less frequently, year 881 Ab urbe condita). The denomination 128 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 visits the Roman province of North Africa, in order to inspect Legio III Augusta stationed at Lambaesis. For strategic reasons the legionnaires are located in the Aurès Mountains.
- Hadrian's Wall is completed in Britain. Built mostly of stone in the east and with a wooden palisade in the west. They construct at least 16 forts, about 15,000 legionaries digging ditches, quarrying rock and cutting stone, preventing idleness which led to unrest and rebellions in the ranks.
- Roman agriculture declines as imports from Egypt and North Africa depress wheat prices, making it unprofitable to farm and forcing many farmers off the land.
- Roman bakeries produce dozens of bread varieties, and the Romans distribute free bread for the poor.
- Hadrian begins his inspection of the provinces of Greece, Asia Minor and Egypt.