Demirci is a district of Manisa, it is a settlement 160 km from the city center. With the introduction of the baroque and rococo styles of European architecture to our country since the Tulip Period, the innovation process in our art has started. These styles were not used exactly as in Europe, Otoman craftsmen have formed a style unique to Turkey. Westernization movements first started in the palace and its surroundings, and in time, it has shown itself in many parts of Anatolia, especially in mosques. One of the art branches that became wıdespread in the Ottoman Empire during the Westernization period is wall paintings. Wall paintings, which started to be seen in Turkish architectural decoration art since the 18th century, appear in many civil and religious buildings The interiors of Demirci Kışlak Old Mosque and Ahatlar Mosque are also decorated with murals that reflect a new understandıng of style. Flower bouquets, trees, stil lifes and symbolic motifs coming from vases of different forms are among the selected topics. These paintings reflect a common painting program that we see in Anatolia in the 19th century. The aim of this article is to compare the wall paintings of Demirci Kışlak Old Mosque and Ahatlar Mosque, which have become widespread with the efecct of Westernization, with the other religious buildings in the provinces and to reveal the place and importance of the buildings in the history of Turkish architectural decoration