Kamskoye Ustye (Russian: Ка́мское У́стье; Tatar: Кама Тамагы) is an urban locality (an urban-type settlement) and the administrative center of Kamsko-Ustyinsky District in the Republic of Tatarstan, Russia, located on the Kuybyshev Reservoir, near the confluence of the Volga and Kama Rivers, 117 kilometers (73 mi) from the republic's capital of Kazan.

[2] Kamskoye Ustye served as the district administrative center in 1930–1963, and again since 1965.

[1] As a municipal division, Kamskoye Ustye is incorporated within Kamsko-Ustyinsky Municipal District as Kamskoye Ustye Urban Settlement.

[2] Industrial facilities include a dairy factory and several construction and agricultural enterprises.

[2] The nearest railway station is Karatun on the Ulyanovsk–Sviyazhsk line, 57 kilometers (35 mi) east of Kamskoye Ustye.