Orocrambus ramosellus is a moth in the Crambidae family. It was described by Doubleday in 1843. It is found in New Zealand, where it has only been recorded from the North and South Island. The habitat consists of pastures. The wingspan is 23–29 mm. Adults have been recorded on wing from October to July. The larvae feed on Festuca novaezealandiae, Poa caespitosa, Agrostis tenuis, Alopercus pratensis, Bromus catharticus and Poa annua.