Zeuxidia amethystus, the common Saturn, is a species of butterfly in the family Nymphalidae.

Its forewings have a broad iridescent-blue band with a similar blue patch on the hindwing.

It is not abundant in Thailand, Malaysia, Sumatra and Borneo.

[1] It obtains minerals using mud-puddling behavior and seem to be prefer ammonium ions rather than sodium.

[2] It is sometimes collected and displayed as fine wall art.