Mostafa Hosseini Khamenei (Persian: سید مصطفی حسینی خامنه‌ای; born 5 February 1965)[1] is an Iranian Twelver Shia cleric[2][3][4] and the oldest son of Iran's supreme leader, Ali Khamenei.

[5][6][7] He is[8] also known as "Hujjatul-Islam/Ayatollah Seyyed Mostafa Khamenei", the son-in-law of Azizollah Khoshvaght (عزیزالله خوشوقت).

[9][10][11] He is also the eldest brother of: Mojtaba, Masoud (Mohsen) and Meitham Khamenei.

According to Ahmad Marvi, who is the assistant of seminary communications in Office of the Supreme Leader of Iran: Seyyed Mostafa Khamenei is teaching in seminary sciences/lessons (Makasib and Kifayah) in Qom.

Moreover, his father has prohibited his sons from accepting governmental positions.