Ithomeis is a genus in the butterfly family Riodinidae present only in the Neotropical realm.

The pattern of black, orange, and large translucent areas found in Ithomeis is shared by toxic genera from the Ithomiinae (examples are Ithomia and Oleria) and a number of toxic Arctiidae.

The pattern is also shared with several other Riodinidae genera (examples are Stalachtis, Ithomiola, and Brachyglenis), which may be part of mimicry rings.

I. a. satellites and I. a. astrea closely resemble species of Heliconius.

Other subspecies include I. a. mimica and I a. stalachtina, which have extensive orange markings and much reduced hyaline areas, and these mimic toxic ithomiines in the genera Pseudoscada, Hyposcada, and Hypoleria.