Schmidtea lugubris is a species of freshwater flatworm, a dugesiid triclad found in Europe.

S. lugubris is slender in shape.

The head is blunt and rounded at full growth, but medium-sized individuals have lateral lobes forming a triangular shape.

The auricles of the head are a translucent grey color, but the rest of the backside is a dark brown.

[1] S. lugubris preys mainly on oligochaetes and gastropods.