Alcadia minima is a species of an operculate land snail, terrestrial gastropod mollusk in the family Helicinidae.
The height of the shell attains , its greatest diameter .
(Original description in Latin) The smooth shell has a rotund-depressed shape. It is rose-white. The spire is short and contains five, convex-flat whorls. The aperture is semi-lunar with a thin, reflexed outer lip. The columella is minimally thickened. The aperture shows a toothed, notched columellar angle.
This species occurs in Cuba.