Vertigo dedecora is a species of very small air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Vertiginidae.

(Original description) The shell is exceedingly small, obesely oval, dark red-brown and faintly striate.

The body whorl swells in a very conspicuous crest some distance behind the aperture, and is grooved at the position of the upper palatal fold.

The lower palatal fold is very small and deeply situated.

The upper palatal is large and prominent All the teeth are whitish.