Dactylispa subquadrata is a species of beetle of the family Chrysomelidae. It is found in China (Hunan, Jiangsu, Yunnan), Japan and Korea.
The recorded host plants for this species are Castanea crenata, Castanopsis cuspidata, Quercus acutissima, Quercus glauca, Quercus mongolica grosseserrata, Quercus serrata and Quercus variabilis.