Korietz (Russian: ) was a Russian gunboat served in Russian Pacific Fleet. Laid down in Stockholm in 1886, launched on August 7, 1886, commissioned in 1888. There were 8 more gunboats of her class - Mandzhur and Khivinets served on the Baltic, Donets, Zaporozhets, Kubanets, Terets, Uralets and Chernomorets on the Black Sea.
Participated in the joint attack on Taku Forts in May-June 1900.
Together with Russian cruiser Varyag they participated in the Battle of Chemulpo Bay with the Imperial Japanese Navy.
A day before the Japanese made a pre-emptive strike, Korietz (under the command of G.P.Belyaev) was sent by Varyags captain Rudnev to Port Arthur with a letter to the Russian governor. Korietz was intercepted by Japanese destroyers and forced to turn back. As Belyaev reported, destroyers fired some torpedoes into his gunboat (or, at least, initiated the attack) and he returned fire with two shots from the 37mm gun - the first of the Russo-Japanese War.
Korietz was equipped with two 203-mm (8 in) old heavy guns, none of this type or heavier were present aboard the Varyag.
Korietz was blown up and scuttled after the battle on February 9, 1904.