Halliday
The taxon authority Halliday may refer to:
- Bruce Halliday, Australian arachnologist
- Geoffrey Halliday (1933–), British botanist
- James Halliday McDunnough (1877–1962, McDunnough), Canadian entomologist
- Patricia Halliday (1930–), English botanist
- Thomas John Dixon Halliday, British palaeontologist
- William Halliday Piel, U.S. arachnologist