Abdullah al-Aftah ibn Ja'far al-Sadiq (d.766 CE / 149 A.H.) was the eldest surviving son of Ja'far al-Sadiq (after al-Sadiq’s death) and the full-brother of Isma'il ibn Jafar. Abdullah’s title "al-Aftah" derives from the Arabic words "aftah al-ra’s" (broad-headed) or "aftah al-rijlayn" (broad-footed) used to describe his appearance. During the lifetime of his father, Abdullah al-Aftah had supported the revolt of his relative Muhammad ibn Abdallah An-Nafs Az-Zakiyya.