The Oregon swallowtail (Papilio machaon oregonius, sometimes classified as Papilio oregonius or Papilio bairdii oregonius[1]) is a subspecies of swallowtail butterfly native to the United States of America, Oregon, Washington, and Idaho and south-central British Columbia in Canada.

[4][5] The adult Oregon swallowtail has a yellow abdomen with black lines.

[8] The range of the Oregon swallowtail is from southern British Columbia, eastern Washington and Oregon, to Idaho and western Montana, primarily in the lower sagebrush canyons of the Columbia River and many of its tributaries.

As an adult, it eats flower nectar, preferring thistles, balsamroot, and phlox.

[10] On June 6, 1977, the United States Postal Service released sets of four 13-cent stamps illustrating American butterflies, including the Oregon swallowtail.