Bucculatrix univoca is a moth in the Bucculatricidae family. It was described by Meyrick in 1918. It is found in Japan (Kyushu, Ryukyu), Taiwan and India. The wingspan is 5-6.5 mm. The forewings are blackish-brown and the hindwings are grey. The larvae feed on Ipomoea congesta, Ipomoea reptans and Ipomoea batastas. They mine the leaves of their host plant. The young larvae form a coiled or spiral linear mine.