Elachista catarata

{{Short description|Species of moth}}

{{one source|date=November 2021}}

{{Speciesbox

| taxon = Elachista catarata

| authority = Meyrick, 1897

}}

Elachista catarata is a moth of the family Elachistidae that can be found in eastern New South Wales, the Australian Capital Territory and Tasmania.{{cite journal|url=https://books.google.com/books?id=flsAVRnbaA4C&pg=PA68 | page=68 |author=Lauri Kaila|title= Elachistine Moths of Australia: Lepidoptera, Gelechioidea, Elachistidae|year=2011|publisher=CSIRO|journal=Monographs on Australian Lepidoptera|volume=11|isbn=9780643103054}}

The wingspan is {{convert|7.8|-|8.8|mm}} for males and {{convert|7.8|-|9.5|mm}} for females.

The larvae feed on Carex appressa and Carex longebrachiata. They mine the leaves of their host plant. The mine reaches a length of about {{convert|200|mm}}.