Cerodrillia thea is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.

The shell is ashy olivaceous, covered with a shiny very thin epidermis, and is claret-brown within the aperture.

There are eight, moderately convex, smooth whorls with eleven short, somewhat oblique, slightly curved, strong axial ribs, more prominent on the periphery and fading away towards the sutures and not distinctly differentiated from the interspaces.

The wide, oval aperture is short and is internally claret brown.

[3][4] This species occurs in the Gulf of Mexico, the Caribbean Sea and the Lesser Antilles; in the Atlantic Ocean off Eastern Brazil at depths up to 203 m.