Alcadia nobilis is a species of an operculate land snail, terrestrial gastropod mollusk in the family Helicinidae.

[1] (Original description) The shell is depressed globose-conic, thick, and solid.

It is white beneath and at the end of the body whorl, while the rest of the shell is rufous or dark brownish red.

The body whorl is much depressed or even sinuate between the periphery and the suture at its termination.

The outer lip is rather thick and moderately reflected along the middle only, featuring a notch similar to that of Alcadia maxima G.B.