Crenilabium exile is a species of sea snail, a marine gastropod mollusk in the family Acteonidae.

(Described as Acteon exilis)The oblong or somewhat spindle-shaped shell is semitransparent and glossy.

The sculpture consists of numerous spiral strisa or impressed lines, which are quite smooth or plain, instead of being punctate as in other species of this family.

The aperture is rather narrow, irregularly pear-shaped and expanded at the base.

It occurs off the Atlantic Ocean off USA (from Massachusetts to Florida); Iceland; Azores; Bay of Biscay; Portugal, West Africa; Mediterranean Sea off Spain, Malta, Italy; in the Caribbean Sea off East Mexico, Cuba, Costa Rica, Grenada, Martinique and Guadeloupe