Kamsko-Ustyinsky District (Russian: Камско-Устьинский райо́н; Tatar: Кама Тамагы районы) is a territorial administrative unit and municipality of the Republic of Tatarstan within the Russian Federation. The district is located in the west of the republic, on the right bank of the Volga River. The territory of the district includes 49 settlements which are organized into three urban and seventeen rural settlements. The district population was 14,747 in 2020. The administrative center of the district is the urban-type settlement Kamskoye Ustye.