The aim of this work, which was introduced to a Byzantine church in the Çeltikdere village of Bolu Province of Seben District of Bolu and which was dated to the Middle Byzantine Period, is to address the dating problems of the Çeltikdere Byzantine Church and to document its plan-architectural features. The name in the Byzantine period, the date of construction, the building which is unknown of the builder is ruined nowadays. Although many studies have been done on this church, neither consistent information about the history of the church nor the architectural-plan features has been revealed. As a result of the researches carried out in the Prime Ministry Ottoman and Republic archives, no records were found about the history of the church. Built a wooden mosque on the top floor at an unknown date, the church was used as a mosque until 1952. From some historical events that took place in the region and its surroundings, it is estimated that the Çeltikdere Byzantine Church was built sometime between the end of the 10th century and the middle of the 11th century due to its plan and architectural features. It is understood that in accordance with the information included in the publications of previous years about the building and the measurements taken were constructed in the plan of the cross in squared scheme, which struck the Middle Byzantine Period religious architecture. The quality of the stonemasonry of the building is also remarkable. Carried out a detailed literature search and land survey by taking measurements of the church, plans have been drawn and restitution studies have been done and documented by photographing and they have been evaluated by comparing them with the churches with similar plan and architectural features built on the Byzantine borders, especially in Anatolia.