Year 325 (CCCXXV) was a common year starting on Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Proculus and Paulinus (or, less frequently, year 1078 Ab urbe condita). The denomination 325 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.

This article relies largely or entirely on a single source. (February 2024)

• Ammianus Marcellinus, Roman historian (approximate date)
• Procopius, Roman general and usurper (approximate date)
• Wang Meng (or Jinglüe), Chinese prime minister (d. 375)

• October 18 – Ming of Jin, Chinese emperor (b. 299)
• Iamblichus, Syrian philosopher and writer (b. 245)
• Licinius, Roman consul and emperor (executed)
• Li Ju (or Shihui), Chinese general and warlord
• Sextus Martinianus, Roman Emperor (executed)
• Tuoba Heru, Chinese prince of the Tuoba Dai