Ocnerostoma piniariella is a moth of the family Yponomeutidae. It is found in Europe. The species closely resembles Ocnerostoma friesei. The wingspan is c. 9 mm. The lanceolate forewings are shining light grey. Hindwings are grey. The larva is shining brown; head and plate of 2 black. The moth flies in one generation from June to August. . The larvae feed on Scots pine.