Siraj al-Din 'Ali b. 'Uthman al-Ushi al-Farghani (Arabic: سراج الدين علي بن عثمان الأوشي الفرغاني) 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 or from the opening words Qasidat Yaqulu al-'Abd.