The taxon authority Alexander may refer to:
- Boyd Alexander (1873-1910) - British explorer and ornithologist.
- Brett J.R. Alexander - New Zealand Nematologist
- Charles Ivan Alexander - Ostracodologist
- Charles Paul Alexander (1889-1981) - Entomologist
- Edward Johnston Alexander (1901-1985) - Botanist in the United States.
- Laura G. Alexander entomologist
- Richard D. Alexander - Entomologist
- Wilfred Backhouse Alexander (1885-1965) - British ornithologist and entomologist