Nagiella is a genus of moths in the species-rich subfamily Spilomelinae of the family Crambidae.
The six species of Nagiella are distributed in East and Southeast Asia as well as the Indian subcontinent.
The caterpillars of Nagiella inferior have been recorded on Coffea liberica in the Rubiaceae family, while Rhus chinensis (Anacardiaceae) has been reported as larval foodplant for N. quadrimaculalis.
Nagiella was established by Eugene G. Munroe in 1976 as a replacement name for Nagia <small>Walker, 1866</small>, a name that was preoccupied by Nagia <small>Walker, 1858</small> in the Lepidoptera family Erebidae. The type species, Nagia desmialis <small>Walker, 1865</small>, is now considered a synonym of Nagiella quadrimaculalis <small>(Kollar & Redtenbacher, 1844)</small>, which was described earlier and therefore has priority over the younger name. The name quadrimaculalis <small>Motschultsky, 1861</small> (published in the genus Botys) is a secondary homonym of the previously published name quadrimaculalis <small>Kollar & Redtenbach, 1844</small> (published in Scopula), and therefore the name inferior <small>Hampson, 1899</small> (in the genus Sylepta, a misspelling of Syllepte) was proposed as objective replacement name.
In the past, the genus was considered a synonym of Pleuroptya, until in 2017 a taxonomic revision showed that Nagiella is distinct from Pleuroptya, thus reinstating it as a valid genus.
Nagiella is placed in the tribe Agroterini of the subfamily Spilomelinae.