Hemilienardia thyridota is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.

(Original description) This is a pure white, curtly pyramidal species, the surface not shining.

It contains six turreted whorls, angled at the suture, ventricose, longitudinally thickly ribbed, transversely ornamented with few lirations.

In the middle of the upper whorl and doubly-ranked in the body whorl, are transverse regular deep pittings, squarrose, profound, between the ribs, which suggest the trivial name (from Ancient Greek : thyridotos : furnished with windows or doors).

The outer lip is thickened and furnished with four strong denticles.