William Barrett
William Barrett may refer to:
- W. S. Barrett, English classical scholar
- William Barrett , English antiquary and surgeon
- William Barrett , English consul
- William Barrett , American philosopher and professor
- William Barrett , British–Australian Anglican Dean of Brisbane
- William A. Barrett, American lawyer and politician
- William Edmund Barrett, American writer
- William Emerson Barrett, American journalist and politician
- William F. Barrett, English physicist
- William H. Barrett, American federal judge
- William Lewis Barrett, English flautist and music teacher
- William N. Barrett, American politician