Aristotelia saturnina is a moth of the Gelechiidae family. It was described by Meyrick in 1917. It is found in Peru. The wingspan is 11-12 mm. The forewings are rather dark fuscous, sometimes whitish-speckled, the dorsal area more or less suffused or marked with ochreous. There are obscure darker oblique bars from the costa at one-sixth and one-third to the fold, marked with black on the fold, more or less edged with whitish towards one another. The discal stigmata are blackish with a suffused brownish-ochreous streak beneath them and there is a suffused pale brownish-ochreous spot on the costa at four-fifths. The hindwings are grey.