Mūsá aṣ-Ṣadr (4 June 1928 – disappeared in Libya on 31 August 1978) (Persian: امام موسى صدر‎‎, Arabic: السيد موسى الصدر‎, also Musā-ye Sader and Moussa Sadr) was an Iran-educated Lebanese philosopher and Shī‘ah religious leader who went missing in Libya. Many theories exist around the circumstances of his disappearance, none of which have been proven.