Hypermastus randolphi is a species of sea snail, a marine gastropod mollusk in the family Eulimidae.

Bartsch and Vanatta are the major contributors to the taxonomic synonymy of this species of Caenogastropoda.

(Original description) The smooth shell is rather slender and shining.

It is bluish white when empty, but when the animal is dried in, the spire is orange colored above, pink in the middle with sometimes a slight yellowish band on the body whorl, opaque.

The outer lipis sloping to the right, nearly straight; in profile it is moderately arched forward below and sometimes retracted very slightly above.