Swallowtail may refer to:

• Swallow-tail coat, a formal tailcoat worn traditionally as part of white tie.
• Swallowtail butterfly, large colorful butterflies from the family Papilionidae.
• The 1996 film Swallowtail Butterfly, directed by Shunji Iwai.
• Swallowtail (flag) a term in vexillology.

See also

• Swallow-tailed

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