Euchlaena johnsonaria, Johnson's euchlaena moth, is a species of moth of the family Geometridae. It is found in North America, where it has been recorded from southern coastal British Columbia east to Nova Scotia, south to New Jersey, Missouri and Oregon. The habitat consists of deciduous wooded areas. The wingspan is about 32 mm. The ground colour of the forewings varies from light to dark rust-brown. The antemedial and postmedial lines are thin and well defined. Adults are on wing from May to August.