Cressida cressida, the clearwing swallowtail or big greasy, is a Troidine swallowtail butterfly found in northern Australia, New Guinea, Maluku, and Timor. It is in the monotypic genus Cressida.

Remarkably, this species is not particularly closely related to other Asian swallowtails, but instead seems to be the closest living relative of the peculiar South American swallowtails of genus Euryades.

Johann Fabricius acquired the first specimens of this species from Joseph Banks, who collected them at the site of present-day Cooktown in 1770. Fabricius described the male and female as Papilio cressida and P. harmonia respectively, under the premise that the two were different species.

The original specimens now reside in the Natural History Museum, London. Both male and female now possess the same name, cressida, however, this species is no longer placed in the genus Papilio, but in the genus Cressida.

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