Haddad
The taxon authority Haddad may refer to:
- Célio Fernando Baptista Haddad (born 1959), Brazilian herpetologist, full name Célio Fernando Baptista Haddad
- Charles Richard Haddad, South African entomologist
- Maria Angélica Haddad, Brazilian cnidariologist
- Mustapha El Haddad, Spanish marine biologist