Phyllonorycter trinotella is a moth of the Gracillariidae family. It is known from Québec in Canada and New Jersey, Maine, Connecticut, Ohio, Vermont and Michigan in the United States. The wingspan is about 5 mm. The larvae feed on Acer species, including Acer platanoides, Acer rubrum and Acer saccharinum. They mine the leaves of their host plant. The mine has the form of a small tentiform, much wrinkled mine on the underside of the leaf.