Stigmella dentatae is a moth of the Nepticulidae family. It is found in Japan (Hokkaido), Russia (Primorsky Krai) and China (Heilongjiang). The wingspan is 5.1-6.4 mm. Adults are on wing in May and again from July to September. There are two generations per year. The larvae feed on Quercus mongolica (including var. grosseserrata in Japan) and Quercus dentata (in Primorskiy Kray). They mine the leaves of their host plant. The mine consists of a long narrow linear gallery with linear black frass throughout, similar to Stigmella aladina and Stigmella roborella.