William Porter
William Porter may refer to:
Law and politics
- William Dennison Porter, South Carolina lieutenant governor
- William Porter (Attorney General), attorney-general of the Cape Colony
- William Field Porter, New Zealand politician
- William G. Porter, American police officer
- William J. Porter, American diplomat; former ambassador to Canada and Saudi Arabia, among others
- William Archer Porter, British lawyer and educationist
- William Haldane Porter, British civil servant
- William Porter (died c. 1593), member of the Parliament of England for Grantham, Bletchingley, and Helston
- William Porter (fl. 1388), Member of Parliament for Southwark
- William Porter (died 1436), MP for Cambridgeshire
- William W. Porter, American attorney and legal author
- William Wood Porter, American military officer and jurist
- William Thomas Porter, British barrister and colonial judge
Medicine
- William Townsend Porter, American physician, physiologist, and medical educator
- William Henry Porter (surgeon), president of the Royal College of Surgeons in Ireland
Military officers
- William D. Porter, flag officer of the United States Navy
- * USS William D. Porter (DD-579), ship named after him
- William N. Porter U.S. Army Major General and chief of the Army Chemical Warfare Service during World War Two.
- William Wood Porter, American military officer and jurist
Music
- William Porter (organist), American organist and improviser
- Willy Porter, American singer-songwriter
Religion
- William Porter (bishop), English Roman Catholic archbishop in present-day Ghana
- William Henry Porter (writer), American minister and writer
Others
- William H. Porter, prominent banker in New York City
- William Porter (hurdler), American track and field hurdler
- William Sydney Porter, American writer who used the pen name O. Henry
- *William Sydney Porter Elementary School, school in Greensboro, North Carolina
- William T. Porter, American writer and founder of Spirit of the Times
- William A. Porter, founder of E*TRADE