Erupinae is a subfamily of the lepidopteran family Crambidae. It was described by Eugene G. Munroe in 1995.
Originally, Erupinae were described as a tribe in the subfamily Crambinae. Later, they were moved to Midilinae. A phylogenetic analysis of Crambidae moths found that Erupa does not form a monophyletic group with Midilinae, but is the sister group to either Crambinae or a monophylum of Heliothelinae and Scopariinae. Erupini were consequently removed from Midilinae and established as a separate subfamily.
The subfamily currently comprises three genera: Erupa <small>Walker, 1864</small> with 36 species, Lancia <small>Walker, 1859</small> with the single species L. phrontisalis <small>Walker, 1859</small>, and Schoenerupa <small>Hampson, 1919</small> with the species S. thermantis <small>Hampson, 1919</small>.
Erupinae occur exclusively in the Neotropical realm. The foodplants of the caterpillars are unknown, but monocotyledons have been suggested.