The ZIS-485, army designation BAV (Russian, БАВ, большой автомобиль водоплавающий - bolshoi avtomobil vodoplavayushchiy, big floating vehicle), is a Soviet amphibious transport, a copy of the WWII American DUKW.

During World War II, the Soviets received 586 DUKW-353 amphibious trucks under the Lend-Lease Act.

[6] The design was regarded as successful, so it was decided to build a similar domestic vehicle.

Due to lack of own experience, the DUKW was copied, although with improvements enhancing its capability.

[10] In use by the Soviet Union and its allies and client states the BAV was gradually replaced by the much larger tracked PTS amphibious vehicles.