Hagon Beck is a minor watercourse which rises in the north of the English county of Norfolk.

[1] It falls into Great Lake in Gunton Park, which in turn feeds Suffield Beck.

The Domesday Book of 1068 records a watermill[2] on Hagon Beck at Gunton that continued working right through the medieval period.

Hagon Beck fed the lake, and the mill was set below the water level which provided the power to drive two identical 12-foot-diameter (3.7 m), 5-foot-wide (1.5 m) breastshot wheels via a guillotine gate.

The outflow from the sawmill then became Hagon Beck once more, eventually rejoining the original watercourse.