Ust-Kamchatsk (Усть-Камча́тск) is an urban-type settlement in Kamchatka Krai, Russia, located on the eastern shore of the Kamchatka Peninsula at the mouth of the Kamchatka River some 50 km away from the Klyuchevskaya Sopka volcano and 522 km from Petropavlovsk-Kamchatsky. Population: 4,900 (2005 est.); 5,231 (2002 Census); 13,611 (1989 Census).
Ust-Kamchatsk was founded in 1731 as a settlement of Ust-Primorsky (Усть-Примо́рский) and later renamed Ust-Kamchatsk (1890). There is a sea port, a fish-processing plant, a few woodworking factories, and Ust-Kamchatsk Airport (opened in 1937) in Ust-Kamchatsk.