The Mk 5 or Mine G.S. Mk V was a cylindrical, metal-cased U.K. anti-tank blast mine that entered service in 1943, during the Second World War.   It was replaced in British service with the Mk 7 mine. Two versions of the mine were produced, the Mk. V and the Mk. VC with the same external dimensions. The only difference was that the Mk. VC had a half-sized explosive charge.

The mine used a spider pressure plate that makes it resistant to blast overpressure.   The spider rests on a central Mk 3 fuse (sometimes referred to as No.3 Mk I), which contains a spring-loaded striker held in place by a shear pin.   The mine, being made largely of steel tended to rust making its activation unpredictable.