The architecture of the Persian Gulf northern shore cities is formed according to the dominant principles of Iran architecture. However; there are some differences. Cities of the Persian Gulf northern shores had relationships with big commercial cities in Asia and Africa through the sea. Thus, these cities were influenced by those regions in architecture. The main question of the article is how the architecture of the Persian Gulf northern shore cities was influenced by its peripheral regions in Asia and Africa? Using the descriptive-analytical method, findings of this research indicate that due to the commercial condition of the region in city architecture during the considered period of the research, the element of Bazaar and caravanserai has been dominant. Also, due to the climate similarity and broad commercial relationship of the Persian Gulf northern shore cities with the two regions of South and Southeast Asia and Zanzibar in East Africa was influenced by these regions in city architecture. These effects appear more in the widespread use of wood materials, especially teak and loop-root mangrove, and in the style and design of multi-storey buildings.