Mangelia paciniana is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.
The length of the shell attains 6 mm, its diameter 2.75 mm.
The whorls of the oblong, turreted shell are not shouldered, but ribbed as in Mangelia vauquelini, not striate. Its color is yellowish or whitish, with brown revolving lines. The whorls are slightly convex, anteriorly subangular. They are crossed by many longitudinal, pronounced, oblique and undulated ribs. The surface is smooth, even under magnifying lens. The oval aperture is oblong. The siphonal canal is wide and very short. The outer lip has a characteristic tooth, situated at the entrance of the sinus.
