Orocrambus mylites is a moth in the Crambidae family. It was described by Meyrick in 1888. It is found in New Zealand, where it has been recorded from Nelson and Marlborough. It is found in the alpine zone. The wingspan is 19–25 mm. The forewings are bluish-brown with greyish fascia. Adults are on wing from December to February. The larvae feed on Chionochloa australis.