Architecture and interior design are living proof of the civilization and progress of a country. They represent the physical and intellectual impact that affects the recipient and are the mirror that reflects the products of a civilization. Turkish architecture and interior spaces are considered the physical product that has an enriching impact which adds scenic richness and are living evidences of the Turkish civilization through the enrichment of architectural and interior details. Both of which carry pages of history for its viewers and represent an important tourism gateway in the region that attracts people near or far. The researcher has found a lack in the studies that deal with Turkish interior designs in Iraq. Therefore, the researcher has decided to study the subject of "The enrichment in the designs of interior spaces of Turkish architecture - case study of the Hagia Sophia mosque" - in an aim to highlight the concept of intellectual and aesthetical enrichment embodied in these spaces and provide an access to this valuable field that is rich in meanings and intellectual connotations, and for this study to be considered the key for follow up studies and a scientific reference to researchers that specialize in Turkish architecture and interior design as they have a significant cultural value internationally in general and the region in particular. In order to achieve the goal of the research (defining enrichment factors of the highest importance in the interior design of the Hagia Sophia mosque), in the theoretical framework, the research deals with the concept of enrichment in terms of linguistics and terminology, types of enrichment in interior design, forms and concepts and to showcase the views of researchers and the extent of formal and conceptual enrichment in the case study to conclude the most important scientific results: - Enrichment in design results from the intensity of various formal details concerning decorations and the color distribution in the surface area unit. Enrichment may also come as a result of the vagueness of details that open wide horizons for explanation and interpretation. - The subjective transformation of the building since it was originally established as a church then changed to a mosque and afterwards to a museum which added a historical to its meaning as well as the formal enrichment in the internal and external design of the building. It has also added mystique and interest to each recipient wishing to know the details of this transformation and its design implications on the building.