Mangelia unifasciata is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

The color of the shell is white, the striae are pale brown.

[2] The white shell has a broad brown band above the aperture, reappearing on the spire, and another one at the base of the body whorl.

The outer lip runs almost parallel to the columella.

[3] This species occurs in European waters off the British Isles and throughout the Mediterranean Sea, especially off Greece, Italy and France.