Siraj al-Din 'Ali ibn 'Uthman al-Ushi al-Farghani () was a Hanafi jurist, Maturidi theologian, hadith expert (muhaddith), Chief Judge or Supreme Judge (Qadi al-Qudah or 'Aqda al-Qudah as he was also called), and researcher who has ferreted out facts and established them (muhaqqiq). He is probably best known for his work on a confession of faith in rhyme entitled al-Qasida al-Lamiyya fi al-Tawhid, also called Bad' al-Amali or from the opening words Qasidat Yaqulu al-'Abd.
He was born or lived in Osh (Ush), by the Ferghana Valley (Ush in today's Kyrgyzstan) and hence his demonym al-Ushi.
His well known writings include:
He died at the end of the 6th /12th century, after 569 AH (1173/4 AD), specifically in 575/1179âÂÂ80.