William Johnston
William Johnston may refer to:
Military
- William Henry Johnston, Scottish recipient of the Victoria Cross
- William J. Johnston, American soldier and Medal of Honor recipient
- William Preston Johnston, lawyer, scholar, poet, and Confederate soldier
- Willie Johnston (Medal of Honor), drummer boy in Company D of the 3rd Vermont Infantry
- William Johnston (British Army officer), Colonel of the 68th (Durham) Regiment of Foot (Light Infantry) 1838–1844
- William Wallace Stewart Johnston, Australian soldier and medical doctor
- William Johnston Jr., American military officer
- William P. Johnston, American sailor and recipient of the Medal of Honor
Politics
- William Johnston (Australian politician), one of the Members of the New South Wales Legislative Assembly, 1874–1877
- William Johnston (Canadian politician), Labour MLA for Medicine Hat, 1921–1926
- William Johnston (congressman), U.S. Representative from Ohio
- William Johnston (Irish politician), Irish politician and Orangeman
- William Johnston (judge), judge, legislator and bureaucrat from Ohio
- William Johnston (Lord Provost), Scottish map publisher and Lord Provost of Edinburgh
- William Ernest George Johnston, Lord Mayor of Belfast
- William Erskine Johnston, Canadian politician
- William F. Johnston, governor of Pennsylvania, 1848–1852
- William Agnew Johnston, American politician in Kansas
- William Johnston (senator), President pro tempore of the California State Senate
- William Johnston (Ontario politician), Ontario MLA
Religion
- William Johnston (minister), Moderator of the General Assembly of the Church of Scotland
- Frank Johnston (priest), Anglican priest and military chaplain
- William Johnston (bishop), of Dunwich
- William Johnston (priest), Jesuit priest, and Christian Zen meditation advocate
Sports
- William Johnston (athlete), Paralympic athlete from Ireland
- William Johnston (cricketer), New Zealand cricketer
- William E. Johnston, American football player and coach of football, basketball and baseball
- Willie Johnston, Scottish former footballer
- Wade Johnston, American baseball player
- Delirious (wrestler), professional wrestler
- Massa Johnston, New Zealand rugby union and rugby league representative
- Billy Johnston (rugby union), English rugby union player
- William Johnston (footballer) from List of Northern Ireland international footballers
- William Johnston (ice hockey) in Manitoba Hockey Hall of Fame
Others
- William Johnston (painter), colonial American painter
- William Johnston (novelist), American novelist
- William Johnston of Liverpool, early benefactor of the University of Liverpool, Liverpool, England
- William Andrew Johnston, American journalist and author
- William Campbell Johnston, Scottish lawyer and cricketer
- Will Johnston, American historian
- William N. Johnston, 16th president of Wesley College
- William L. Johnston, carpenter-architect in Philadelphia
- William Johnston (producer) from Canadian Screen Award for Best Motion Picture
- William Johnston (screenwriter) of The Truth About Love
- William Johnston (editor) from Edward Quillinan
- William Johnston (mariner) from Johnston Passage