Orocrambus crenaeus is a moth in the family Crambidae. It was described by Edward Meyrick in 1885. It is endemic to New Zealand, where it is known from the South Island. The habitat consists of alpine grasslands. The wingspan is 31–38 mm. Adults have been recorded on wing from December to February. Adults of this moth are known to pollinate Brachyscome sinclairii. 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