Year 387 (CCCLXXXVII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Eutropius (or, less frequently, year 1140 Ab urbe condita). The denomination 387 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.

• Vardan Mamikonian, Armenian military leader (d. 451)

• Aelia Flaccilla, Roman Empress and wife of Theodosius I
• Alatheus, chieftain of the Ostrogoths
• Saint Monica, mother of Augustine of Hippo
• Zhu Fatai, Chinese Buddhist scholar (b. 320)