In Islamic architecture, especially in mosque, the main consideration is to the prayer spirit. For this reason, Quran inscriptions cover the most parts of the decorations of architecture. Altars are always one of the elements with full of motifs decoration because of dignity and its position. The decorations are including Quranic verses and themes. Mosque decorations inscriptions are a main source to investigation the views and religious thoughts. Identifying the Quranic Inscriptions of stucco Ilkhanid alters and understanding their contents are the aims of this paper. Totally, decorative inscriptions of Altars are divided to four groups; date, signature (name of the architect and artist. Etc.), supplements and endowments, religious phrases (names of God, the Quran verses, Hadith, name of the prophet and Imams). The present study focuses on the themes of Quranic verses and the contents of them that used in Ilkhanid stucco altars.