|Millennium:||1st millennium BC|
|118 BC by topic|
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Year 118 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Cato and Rex (or, less frequently, year 636 Ab urbe condita). The denomination 118 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.
- The Roman colony of Narbo Martius is founded in Gallia Transalpina.
- The second Dalmatian war ends with victory for Rome and L. Caecilius Metellus assumes the surname Delmaticus
- Micipsa dies and Numidia, following the king's wish, is divided into three parts, a third each ruled by Micipsa's own sons, Adherbal and Hiempsal I, and the king's adopted son, Jugurtha.