Danilia affinis, is a species of sea snail, a marine gastropod mollusc in the family Chilodontaidae.

The rather thin, imperforated shell has a conical spire and rounded, inflated body whorl.

The peristome is flaring in adult shells, with a distinct outer varix and with internal denticles elongated in the spiral direction.

The colour of the shell is whitish with the inner nacre showing through, with vague brownish flames on specimens from shallower sites.

This species is distinguished from Danilia tinei in having the axial lamellae minute and about three times more numerous, the whitish colour and the more inflated and more fragile shell, with more convex whorls.