Abstract Historical mosques represent important structures that convey the art and architecture of the past to the present. These sacred spaces reflect the aesthetic understanding, technological advancements, and cultural richness of their respective eras. However, over time, these works may face various aesthetic and functional issues, risking the loss of their originality and grandeur. Modern mosques, though built to meet the needs of the contemporary era, may also encounter aesthetic problems due to errors in design and implementation. In this study, field research was conducted by examining five historical mosques located in the center of Konya. The aesthetic problems found in these historical mosques were identified and classified into the following categories: Elements used inside the mosque: Warning signs, shoe racks, clocks, brooms, speakers, donation boxes, lecterns, and stools. The form, material, color, texture, and placement of air conditioning units and fans. Installation elements: Cables used in mosque installations. Harmony of color, texture, and material. Lighting. Our research revealed that interventions made in historical mosques often damage the aesthetic value of these structures. Although machine-made carpets, which replace the original ones, attempt to mimic the tones of natural dyes, they often result in disturbing colors. Furthermore, errors in the installation of accessories, such as drilling or breaking Seljuk and Ottoman tiles, can damage these valuable structures. In addition, excessive use of speakers leads to both visual and auditory pollution, while the electrical installations and cable arrangements negatively impact the interior aesthetics of the mosque. Elements such as steel safes at entrances and the placement of large air conditioning units are also incongruent with the mosque's atmosphere. Digital signs showing prayer times and screens used in areas designated for women are among other elements that detract from the mosque's aesthetics. Therefore, it is crucial that any interventions made in historical mosques are carried out with aesthetic sensitivity. Keywords: Historical Mosques, Aesthetic Problems, Technical and Visual Elements, Konya, Türkiye.