Sima Xin, courtesy name Hongshu (弘舒), posthumously known as Prince Zhuang of Xinye (新野庄王), was a son of Sima Jun and his wife or concubine Lady Zang, and a grandson of Sima Yi, regent of the Cao Wei state during the Three Kingdoms era. Besides his heritage, Sima Xin was best known for his involvement in the War of the Eight Princes during the reign of his cousin's son, Emperor Hui of Jin, and his death during Zhang Chang's rebellion.
- Citizenship
- Western Jin dynasty
- Born
- 250
- Died
- 303
