Petropavlovsk-Kamchatskiy is a city and the administrative, industrial, scientific, and cultural center of Kamchatka Krai, Russia. Its population is 179,780.

The city is widely known simply as Petropavlovsk (literally "city of Peter and Paul"). The adjective Kamchatsky ("Kamchatkan") was added to the official name in 1924.

The city is situated on high hills and surrounded by volcanoes. The surrounding terrain is mountainous enough that the horizon cannot be seen clearly from any point in town. Across Avacha Bay from the city in Vilyuchinsk is Russia's largest submarine base, the Rybachiy Nuclear Submarine Base, established during the Soviet period and still used by the Russian Navy. The city is located 6,766 kilometres (4,204 mi) from Moscow and about 2,220 kilometres (1,380 mi) from Vladivostok.