Notoplana vitrea is a species of free-living marine flatworm in the family Notoplanidae.

[2] Notoplana vitrea is a long slender flatworm, growing to a length of about 40 mm (1.6 in), being broadest at the front.

The whitish body has a delicate, fragile appearance and is transparent, so that the pharynx and the convoluted gut can be seen through the cuticle, occupying most of the body space.

Microscopic examination is necessary to distinguish it from several other similar translucent flatworms found in the Mediterranean.

It is a common flatworm and is to be found on the seabed, under stones and among calcareous algae.