The P 4-class torpedo boat, Soviet designations Project 123-bis and Project 123-K, commonly called the Komsomolets class, were Soviet aluminum-hulled torpedo boats. They were armed with twin heavy machine guns and two 450 mm (17.7 in) torpedoes. A large number of them were exported to allied states such as North Vietnam and China. They saw service in a variety of conflicts including World War II, the First Taiwan Strait Crisis, the Vietnam War and the Turkish Invasion of Cyprus.

The D-3-class, designated Project P-19, was a class of Soviet wooden motor torpedo boats (MTB) built before and during World War II. The D stands for Derevyanniy.