Orocrambus thymiastes is a moth in the family Crambidae. It was described by Edward Meyrick in 1901. This species is endemic to New Zealand, where it has been recorded from Southland. O. thymiastes prefers habitat that consists of boggy areas. This species is associated with Chionochloa rubra. The wingspan is 18–23 mm. References Crambinae Moths described in 1901 Moths of New Zealand Endemic fauna of New Zealand Taxa named by Edward Meyrick Endemic moths of New Zealand