Abu’l-Qāsim Ismāʿīl ibn ʿAbbād ibn al-ʿAbbās (Persian: ابوالقاسم اسماعیل بن عباد بن عباس; born 938 - died 30 March 995), better known as Ṣāḥib ibn ʿAbbād (صاحب بن عباد), also known as al-Ṣāḥib (الصاحب), was a Persian scholar and statesman, who served as the grand vizier of the Buyid rulers of Ray from 976 to 995.

[3] Sahib was born on 14 September 938 in Talaqancha, a village roughly 20 miles south of the major Buyid city of Isfahan.

His father was Abu'l-Hasan Abbad ibn Abbas (d. 946), a renowned and well-educated administrator, who composed works on the Mu'tazili doctrine.

[4] He later settled in Isfahan, and served for some time as an official of the Buyid ruler of Jibal, Rukn al-Dawla (r. 935–976).

[5] The story is told that to keep company with his collection of 117,000 books while travelling, Sahib had them "borne by a caravan of four hundred camels trained to walk in alphabetical order".