This study defines and revises the monophyletic tristrigella species group of the genus Nemophora Hoffmannsegg, 1798, characterized by six presumably apomorphic traits, including (but not limited to) a glossy golden vertex and glossy golden basal part of forewing sharply contrasting with the coppery bronze apical part, which features a distinctive pattern of several yellow spots surrounded by dark brown scales. The group comprises four species: N. pendleburyi Kozlov, sp. nov., from Malaysia; N. vitalii Kozlov, sp. nov., from Indonesia, Malaysia and Brunei; N. chalcotechna (Meyrick, 1937) from the Philippines; and N. tristrigella (Walker, 1866) from Indonesia and the Philippines. These specie-s are described and illustrated herein, with identification keys based on external morphology and male genitalia provided. Particular attention is paid to similarities and dissimilarities between N. chalcotechna and N. tristrigella.