Year 233 BC was a year of the pre-Julian Roman calendar. It was formerly known as the Year of the Consulship of Verrucosus and Matho (or, less frequently, year 521 Ab urbe condita). The denomination 233 BC has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

• The Zhao general Li Mu defeats the Qin army, led by Huan Yi, in the Battle of Fei.^[1]

• Deidamia II is the Greek princess and daughter of Pyrrhus II of Epirus (approximate date)
• Han Fei, Chinese philosopher who, along with Li Si, has developed Xun Zi's philosophy into the doctrine embodied by the School of Law (or Legalism) (b. c. 280 BC)