Year 225 (CCXXV) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Fuscus and Domitius (or, less frequently, year 978 Ab urbe condita). The denomination 225 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.

• Emperor Alexander Severus marries Sallustia Orbiana, and possibly raises her father Seius Sallustius to the rank of Caesar.

• The first Christian paintings appear in Rome, decorating the Catacombs.

• January 20 – Gordian III, Roman emperor (d. 244)
• December 26 – Lawrence, Christian martyr (d. 258)^[1]
• Trieu Thi Trinh, Vietnamese female warrior (d. 248)
• Zhong Hui, Chinese general and politician (d. 264)

• Gaius Vettius Gratus Sabinianus, Roman consul
• Gong Lu, Chinese official and politician (b. 195)
• Sun Shao, Chinese official and chancellor (b. 163)
• Xiahou Shang, Chinese general and politician