According to the current administrative division, Pecenek is a neighborhood of the Camlidere District of Ankara. It is located approximately 72 km northwest of Ankara. There are Yoncatepe in the north, Gumele in the south, Inceoz in the east and Yilanla neighborhoods in the west. Although there are many and different types of architectural works in the region, which has begun to develop with the placement of Oguz Turkmen tribes in Ankara and its environs, it is understood that they have not been studied sufficiently. One of them is Pecenek Mosque. In fact, the work has a dome-covered main space and a second unit covered with a mirrored vault, which is connected to the north by a pointed arch opening and a three-domed colonnade of equal size. The minaret is a cylindrical body placed on the western facade that separates the mass of the harim and the last congregation. Although the facades and pulleys are not uniform, they exhibit an alternating masonry of stone and brick, which arc obtained by placing them in alternate rows. Although not considered rich in ornamentation, the small bird houses on the facades and the ibrik depictions in the minaret door arch are important elements of the building. Although it does not have an inscription of its construction, it can be dated to the beginning of the 15th century by means of plan, material, masonry and other architectural features. The work will be presented in detail in all aspects of our work, and its place and importance in Anatolian Turkish architecture will be determined by comparing it with similar structures.