|Millennium:||1st millennium BC|
|98 BC by topic|
Year 98 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Nepos and Didius (or, less frequently, year 656 Ab urbe condita). The denomination 98 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.
- Consuls: Quintus Caecilius Metellus Nepos and Titus Didius
- The Senate passes the Lex Caecilia Didia which bans omnibus bills.
- Nigidius Figulus, Roman philosopher (probable date) (d. 45 BC)
- Terentia, first wife of Cicero (d. AD 4).