Abstract
Chief justice (Ghazi-al-Ghozzat) is a rank in the hierarchy of the Islamic Justice System which was the highest rank after the king. The history of shaping this position in Islamic world refers to Abbasid Era. A chief judge, as the chief of Islamic Justice Organization, supervised the justice system as well as dismissing and appointing Judges. In the justice system of the Seljuk Era, as previous eras, the chief justice was at the top of the hierarchy of the justice system after the king. However, in the Seljuk Era, this position encountered some changes and its authority reduced to some extent. The present article is to explain the place of this position in the structure of justice system and the upheavals which this position had been encountered by investigating the historical materials of the Seljuk Era.