One of the common types of late historical architecture in Iran is the manor houses, most of which were built in the Qajar period and were of interest to the rulers of cities and villages of this period. Most of the manor houses in the Kohgiluyeh region were built during the later Islamic centuries (from the early Qajar period to the first Pahlavi period) due to the weakness of the central government and the resulting chaos, as well as for the purpose of residence and settlement of local khans and their entourage. During a systematic survey conducted by the authors in the Kohgiluyeh region between 1402 and 1404, 34 manor houses were identified. One of the most important goals of this research, in addition to analyzing the data obtained from it and utilizing the results of publications on defensive fortifications and castles, is to study the architecture of the aforementioned buildings. The results obtained indicate that in these buildings, geographically and defensively, natural hills and heights have been given special attention due to their dominance over the surrounding areas and better defensive capabilities. In terms of design, these castles have plans with a central courtyard and are built in an introverted manner and with similar spatial relationships. Plaster and brickwork decorations with slim and geometric motifs are the dominant decorations in this category of buildings. In terms of design, these castles have plans with a central courtyard and are built in an introverted manner and with similar spatial relationships. All the materials used in these castles are indigenous and the uniformity in the use of different materials is clearly seen in the construction of the buildings due to the prevalence of single architectural styles. Plaster and brickwork decorations with slim and geometric motifs are the dominant decorations in this category