Oregoniplana geniculata is a species of planarian in the family Cercyridae.

The specific epithet is derived from the Latin geniculatus, "like the bent knee", in reference to the curved penis papilla of the species.

Its dorsal surface is a brownish color over a cream-colored ground, with pigment accumulating along the body's margin and around the testes and ovaries.

The mouth opening is about a fourth of the body's length from the posterior margin.

The penis papilla is a long, slender cone that curves in a sharp "U"-shape.