Megasurcula stearnsiana is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.

(Original description) The shell is broadly fusiform with an acute spire.

The interior of the aperture is yellowish, lighter within and spotted with brown on the outer lip by the external bands.

The first two whorls are smooth, the later whorls show numerous revolving threads, closely beaded on the spire by incremental lines which follow the outline of the lip.

The threads are not beaded below the periphery of the body whorl, but roughened by the growth lines and somewhat coarser anteriorly.