Cura fortis is a species of freshwater planarian belonging to the family Dugesiidae. It is found in New Zealand.
The specific epithet is derived from the Latin , meaning "firm". This is in reference to the species' large penial papilla.
Cura fortis is about eight millimeters long and 3.5 mm wide. It can range from a dark brown to reddish color on its backside, and its underside is a dark grey with black spots. Its eyes are set in unpigmented patches.