Abu Abdallah Ja'far ibn Abd al-Wahid ibn Ja'far ibn Sulayman ibn Ali al-Hashimi (Arabic: أبو عبد الله جعفر بن عبد الواحد بن جعفر بن سليمان بن علي الهاشمي)[1] (died 871/2?) was a Chief judge of the Abbasid Caliphate, from 854 to 863/4.
He was a minor member of the Abbasid dynasty, being a descendant of Sulayman ibn Ali, the uncle of the caliphs al-Saffah and al-Mansur.[2] Although his jurisdictional background is obscure,[3] he was appointed as chief judge (qadi al-qudat) by al-Mutawakkil in July 854 as a replacement for Yahya ibn Aktham.[4] His tenure in office is notable for his participation in the Arab–Byzantine prisoner exchange of 856, during which al-Hasan ibn Muhammad ibn Abi al-Shawarib acted as his deputy in Samarra.[5] He remained in office until 863 or 864, when he was dismissed and exiled to Basra after the general Wasif al-Turki accused him of engaging with the shakiriyya troops in a suspicious manner.[6] He was eventually allowed to return to the capital, where in 866 he unsuccessfully attempted to settle a violent dispute between the Turkish and Maghariba army regiments.[7] In 870 he led the prayers at the funeral of the caliph al-Muhtadi.[8] He died in 871/2, or in 881/2 or 882/3 according to alternative accounts.[9]