Year 338 (CCCXXXVIII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Ursus and Polemius (or, less frequently, year 1091 Ab urbe condita). The denomination 338 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. (June 2022)

• Isaac the Great, Armenian catholicos (d. 439)

• Flavius Ablabius, Roman consul and politician^[1]
• Li Qi, Chinese emperor of Cheng Han (b. 314)
• Tuoba Yihuai, prince of the Tuoba Dai clan