Year 248 (CCXLVIII) was a leap year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Philippus and Severus (or, less frequently, year 1001 Ab urbe condita). The denomination 248 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 revolts of Pacatianus in Moesia and Iotapianus in Syria are put down by Senator Trajan Decius, by order of Emperor Philip the Arab.
• The Roman Empire continues the celebration of the 1,000th anniversary of Rome, with the ludi saeculares, organized by Philip the Arab.

• Jungcheon becomes ruler of the Korean kingdom of Goguryeo (until 270).^[1]

• Cyprian, Christian writer of Berber descent, becomes bishop of Carthage.
• Origen writes an eight-volume work, criticizing the pagan writer Celsus.

• Flavia Iulia Helena, Greco-Roman Augusta (empress), mother of Constantine I (approximate date) (d. 330)
• Li Liu (Cheng Han or Xuantong), Chinese Grand general (d. 303)
• Sima You (or Dayou), Chinese prince and politician (d. 283)

• Dongcheon, Korean ruler of Goguryeo (b. 209)
• Himiko (or Shingi Waō), Japanese queen regnant (b. 170)
• Lady Triệu (Triệu Ẩu or Triệu Thị Trinh), Vietnamese female warrior (b. 226)
• Wang Ping, Chinese general and politician