108 BC was a year of the pre-Julian Roman calendar.
At the time it was known as the Year of the Consulship of Galba and Hortensius/Scaurus (or, less frequently, year 646 Ab urbe condita) and the Third Year of Yuanfeng.
The denomination 108 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.