The taxon authority Hay may refer to:
- Arthur Hay, 9th Marquess of Tweeddale (1824–1878), also known as Viscount Walden, Scottish ornithologist
- Oliver Perry Hay (1846–1930), U.S. herpetologist, ichthyologist, and paleontologist
- William Delisle Hay (ca 1853-?; W.D.Hay), British botanist
- William Perry Hay (1871–1947), U.S. zoologist
- William Winn Hay (born October 12, 1934), U.S. paleontologist, fossilist and geologist
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