What tank has the thickest armor ever?
Jessica Wood
Updated on January 15, 2026
The Panzerkampfwagen VIII Maus (aka "Mouse") is the heaviest fully enclosed armoured fighting vehicle ever built. The Germans might not have built the Ratte, but that didn't stop them building monster tanks like this one. Nearly 200 tonnes of monstrous fighting machine that came into development in 1944.