Year 129 BC was a year of the pre-Julian Roman calendar.
At the time it was known as the Year of the Consulship of Tuditanus and Aquillius (or, less frequently, year 625 Ab urbe condita) and the Sixth Year of Yuanguang.
The denomination 129 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.