The MT-LB is a Soviet multi-purpose, fully amphibious, tracked armored fighting vehicle in use since the 1970s. It was also produced in Poland, where its YaMZ engine was replaced by a Polish 6-cylinder SW 680 diesel engine.

An amphibious vehicle is a vehicle that is a means of transport viable on land as well as on or under water. Amphibious vehicles include amphibious bicycles, ATVs, cars, buses, trucks, railway vehicles, combat vehicles and hovercraft.