Euplana gracilis is a species of marine flatworm belonging to the family Euplanidae.

E. gracilis is slender and elongate in shape, reaching up to 8 mm in length.

The front end may be pointed or rounded, while the back end may be obtuse or rounded.

There are six eyes on each side, of which four are in a lengthwise row, and two obliquely placed together.

Particularly, it has been found to prey on the amphipod Apocorophium lacustre.