The taxon authority Day may refer to:
- Alva Day Grant (1920–2014, A.G.Day), botanist, also as Alva George Day
- Francis Day, ichthyologist
- Henry Day, palaeontologist
- John Day (1824–1888, J.Day), botanist
- John Hemsworth Osborne-Day (1909–1989), annelidologist
- Julia J. Day, ornithologist, herpetologist
- Julie L. Day, ichthyologist
- Maxwell Frank Cooper Day, entomologist
- Michael Charles Day (1942–2020), entomologist
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