|Centuries:||2nd century – 3rd century – 4th century|
|Decades:||260s 270s 280s – 290s – 300s 310s 320s|
|Years:||295 296 297 – 298 – 299 300 301|
|298 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1051|
|Chinese calendar||丁巳年 (Fire Snake)
2994 or 2934
— to —
戊午年 (Earth Horse)
2995 or 2935
|- Vikram Samvat||354–355|
|- Shaka Samvat||220–221|
|- Kali Yuga||3399–3400|
|Iranian calendar||324 BP – 323 BP|
|Islamic calendar||334 BH – 333 BH|
|Minguo calendar||1614 before ROC
|Seleucid era||609/610 AG|
|Thai solar calendar||840–841|
Year 298 (CCXCVIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Faustus and Gallus (or, less frequently, year 1051 Ab urbe condita). The denomination 298 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.
- Battle of Lingones: Constantius Chlorus defeats the Alamanni in the territory of the Lingones (Langres) in Gaul. He strengthens the border along the Rhine frontier.
- Battle of Vindonissa: Constantius I defeats at Vindonissa (modern Switzerland) the Alamanni.
- March 10 – Emperor Maximian concludes his campaign in North Africa against the Berbers, and makes a triumphal entry into Carthage.
- The Baths of Diocletian are commissioned by Maximian in honor of Emperor Diocletian. Christians are expelled from the Roman army.
- Galerius invades Armenia with an army of 25,000 men. He makes personal reconnaissances, and marched deep in occupied Mesopotamia.
- Battle of Satala: Galerius decisively defeats king Narseh. He captures the Persian camp, including Narseh's family, harem and treasure.
- King Tiridates III is restored as ruler of Armenia.