The 130 mm/50 B13 Pattern 1936 was a 130 mm (5.1 in) 50 caliber Soviet Union naval gun. The gun was used as a standard destroyer weapon during World War II, and it was also used as a coastal gun and railway gun. The gun was produced in three different versions which all had mutually incompatible ammunition and range tables. Mountings for the weapon included single open mounts and twin turrets. Besides the Soviet Union, the gun was used on ships sold or donated to Poland, People's Republic of China, Egypt and Indonesia. Finland captured five guns during Continuation War and used them until the 1990s.