Turbonilla garrettiana is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.

They are ornamented with poorly developed, broad, low, almost vertical axial ribs which are strongest at the summit of the whorls and gradually grow weaker toward the periphery.

The intercostal spaces are broad and shallow, scarcely sunk below the general surface of the shell.

The columella is oblique, somewhat revolute, and provided with a prominent fold, a little anterior to its insertion.

[1] The type specimen was found in the Pacific Ocean off the Viti Levu Group.