Atthis can be:
Atthis (mythology), in Greek myth, the daughter of Cranaus Atthis (plural: Atthides), the traditional title for ancient historical works on Athenian history, written by an atthidographer A woman mentioned in love poetry by Sappho Atthis (bird) in a genus in the hummingbird family Atthis (Obernewtyn character) in the Obernewtyn Chronicles, by Isobelle Carmody 8975 Atthis, an asteroid