William Porter

William Porter may refer to:

Law and politics

William Dennison Porter (1810–1883), South Carolina lieutenant governor
William Porter (Attorney General) (1805–1880), attorney-general of the Cape Colony
William Field Porter (1784–1869), New Zealand politician
William G. Porter, American police officer
William J. Porter (1914–1988), American diplomat; former ambassador to Canada and Saudi Arabia, among others
William Archer Porter (1825–1890), British lawyer and educationist
William Haldane Porter (1867–1944), British civil servant
William Porter (died c. 1593), member (MP) of the Parliament of England for Grantham, Bletchingley, and Helston
William Porter (fl. 1388), Member of Parliament (MP) for Southwark
William Porter (died 1436), MP for Cambridgeshire
William W. Porter (1856–1928), American attorney and legal author
William Wood Porter (1826–1907), American military officer and jurist

William Townsend Porter (1862–1949), American physician, physiologist, and medical educator
William Henry Porter (surgeon) (1790–1861), president of the Royal College of Surgeons in Ireland

William D. Porter (1808–1864), flag officer of the United States Navy
- USS William D. Porter (DD-579), ship named after him
William N. Porter (1886–1973) U.S. Army Major General and chief of the Army Chemical Warfare Service during World War Two.
William Wood Porter (1826–1907), American military officer and jurist

William Porter (archbishop) (1887–1966), English Roman Catholic archbishop in present-day Ghana
William Henry Porter (writer) (1817–1861), American minister and writer

William H. Porter (1861–1926), prominent banker in New York City
William Porter (hurdler) (1926–2000), American track and field hurdler
William Sydney Porter (1862–1910), American writer who used the pen name O. Henry
- William Sydney Porter Elementary School, school in Greensboro, North Carolina
William T. Porter (1809–1858), American writer and founder of Spirit of the Times
William A. Porter (1928–2015), founder of E*TRADE