Russian submarine Krab may refer to one of the following submarines:
Russian submarine Krab (1912), a unique submarine of the Russian Imperial Navy; served during World War I; captured by the German and handed over to British forces; scuttled by British at Sevastopol in 1919; wreck raised in 1935 and scrappedRussian submarine K-276 Krab, a Sierra I-class nuclear-powered submarine launched for the Soviet Navy in 1986; later renamed B-276 Kostroma; transferred to the Russian Navy upon its creation