Saʿīd ibn ʿUthmān ibn ʿAffān (Arabic: سعيد بن عثمان بن عفان) (died c. 680) was an Umayyad general and military governor of Khurasan in 676–677 during the reign of Caliph Mu'awiya I. He was a son of Caliph Uthman (r. 644–656) and a one-time seeker of the caliphate in 675/76.