Orocrambus ephorus is a moth in the family Crambidae. It was described by Edward Meyrick in 1885. It is endemic to New Zealand. It has been recorded from the South Island. The species' preferred habitat consists of alpine tussock grasslands. The wingspan is 31–39 mm. Adults have been recorded on wing from November to February. References Crambinae Moths described in 1885 Moths of New Zealand Endemic fauna of New Zealand Taxa named by Edward Meyrick Endemic moths of New Zealand