|Centuries:||2nd century – 3rd century – 4th century|
|Decades:||260s 270s 280s – 290s – 300s 310s 320s|
|Years:||293 294 295 – 296 – 297 298 299|
|296 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1049|
|Chinese calendar||乙卯年 (Wood Rabbit)
2992 or 2932
— to —
丙辰年 (Fire Dragon)
2993 or 2933
|- Vikram Samvat||352–353|
|- Shaka Samvat||218–219|
|- Kali Yuga||3397–3398|
|Iranian calendar||326 BP – 325 BP|
|Islamic calendar||336 BH – 335 BH|
|Minguo calendar||1616 before ROC
|Seleucid era||607/608 AG|
|Thai solar calendar||838–839|
|Wikimedia Commons has media related to 296.|
Year 296 (CCXCVI) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerius and Constantius (or, less frequently, year 1049 Ab urbe condita). The denomination 296 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.
- Constantius Chlorus assembles two invasion fleets with the intent of crossing the English Channel. The first is under the command of Asclepiodotus, Constantius' long serving Praetorian Prefect. He sails from the mouth of the Seine, and lands near the Isle of Wight where his forces defeat the usurper Allectus in Hampshire. Constantius leaves with his fleet Boulogne and occupies London, saving the city from an attack by Frankish mercenaries who are roaming the province.
- Maximian, emperor (Augustus) of the Roman Empire, mobilised an army, consisting of Praetorian cohorts, Aquileian, Egyptian, and Danubian legionaries, marching through Spain. He crosses the Strait of Gibraltar into Mauretania (modern Morocco) to protect the area against Frankish pirates.
- Constantius Chlorus reconquers Britain, he rebuilds the cities Eboracum (York), Londinium (London), and Verulamium (St Albans).
- Emperor Diocletian dispatched his son-in-law Galerius with a large army to Armenia. he invades Mesopotamia, but suffers a complete defeat outside Ctesiphon against the Persian king Narseh, and is forced to retreat. Galerius crosses the Euphrates into Syria to join Diocletian at Antioch.
- April 22 – Pope Caius dies at Rome after a 13-year reign and is succeeded by Pope Marcellinus as the 29th pope.