Stigmella splendidissimella is a moth of the Nepticulidae family. It is found from Scandinavia to Italy and from Ireland to the Crimea. It is not found in the Iberian Peninsula and the Balkan Peninsula. The wingspan is 4–6 millimetres (0.16–0.24 in). The larvae feed on Agrimonia, Fragaria, Filipendula, Geum urbanum, Potentilla anserina, Rubus caesius, Rubus fruticosus and Rubus idaeus. They mine the leaves of their host plant.