Vitrea diaphana is a species of small, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Pristilomatidae.

The coiled, rather small, dextral shell is very flattened and conical, the seam hardly rises when viewed from the side.

It is transversely elliptic or transversely ovate when viewed directly from above, and has an obliquely crescent shape, due to the strong incision made by the previous whorl.

The umbilicus is closed and often covered by the folded edge of the columella.

[4] Vitrea diaphana lives in moderately moist locations, under leaf litter and dead wood, among rocks and debris of mountain forests.