Microcolona trigonospila is a moth in the Elachistidae family. It was described by Meyrick in 1897. It is found in Australia, where it has been recorded from New South Wales and Victoria. The wingspan is 8-10 mm. The forewings are light reddish-ochreous, the margins suffusedly irrorated with dark fuscous. The stigmata is raised, black and edged with whitish-ochreous. The first discal is somewhat before the middle, the second at three-fourth and the plical obliquely before the first discal. The hindwings are fuscous.