Eudonia cataxesta is a moth in the Crambidae family. It was described by Meyrick in 1884. It is found in New Zealand. The wingspan is 23–27 mm. The forewings are dark slaty-grey, with an indigo-bluish tinge and with fine scattered grey-whitish scales. The hindwings are whitish-grey with a darker grey hindmarginal band. Adults have been recorded on wing in January and February.