Curtitoma incisula is a species of sea snail, a marine gastropod mollusk in the family Mangeliidae.

There are on the body whorl, about twenty rather broad, flattened or rounded ribs, which are nearly straight, a little prominent and usually slightly nodose at the shoulder, but they disappear a short distance below it.

The most characteristic feature of the sculpture is that the surface is marked by rather fine, but regular and distinct, sharply incised, narrow, revolving grooves, which are rather distant, with flat intervals.

The outer lip has a decided angle at the shoulder, below which the edge is well-rounded, and projects strongly forward, in the middle.

[2] This species occurs in the Northwest Atlantic Ocean, Canada and the Gulf of Maine; found at depths between 20 m and 190 m.