William, Willie, or Willy Mason may refer to:
Arts and entertainment William Mason (poet) (1724–1797), English poet, editor and gardener William Mason (architect) (1810–1897), New Zealand architect William Mason (composer) (1829–1908), American composer and pianist William W. Johnstone (a.k.a. William Mason, 1938–2004), American novelist William Mason (director) (fl. 1990s–2010s), director of the Lyric Opera of Chicago Willy Mason (born 1984), American singer-songwriter William Mason (Downton Abbey), fictional character on the television series Downton Abbey
Business and industry William Mason (locomotive builder) (1808–1883), American engineer and builder of locomotives William Mason (gunsmith) (1837–1913), American engineer and inventor working for Remington, Colt, and Winchester William H. Mason (1877–1940), American inventor; first patented masonite
Law and politics
William Temple Thomson Mason (1782–1862), Virginia farmer, businessman and politician William Mason (New York politician) (1786–1860), United States Representative from New York William S. Mason (1832–1899), American politician; mayor of Portland, Oregon William E. Mason (American politician) (1850–1921), U.S. Representative and Senator from Illinois William Mason, 1st Baron Blackford (1862–1947), British politician and public servant William E. Mason (Canadian politician) (1866–1951), Canadian politician; mayor of Regina, Saskatchewan William E. Mason (East St. Louis mayor) (fl. 1970s), American politician; mayor of East Saint Louis, Illinois William D. Mason (born 1959), American prosecutor from Cuyahoga County, Ohio
Military William Mason (1757–1818), American planter and militiaman in the American Revolutionary War William Mason (1760–1830), American Revolutionary War soldier, founder of city of Mason, Ohio William Pinckney Mason (1843–1922), American lieutenant in the Confederate States Navy
Others William Mason (stenographer) (fl. 1672–1709), English writing-master William Mason (religious writer) (1719–1791), English Calvinist author and editor of the Gospel Magazine William Shaw Mason (1774–1853), Irish statistician and bibliographer William Mason (cricketer) (1811–1865), English cricketer Willie Mason (born 1980), Australian rugby league footballer Bill Mason (William Clifford Mason, 1929–1988), Canadian naturalist and canoeist Bill Mason (footballer) (William Sidney Mason, 1908–1995), English football goalkeeper Billy Mason (footballer) (William Bernard Mason, 1855–?), English footballer Bill Mason (rowing coach) (William Graham Mason, born 1950), British Olympic rower and coach
Other uses William Mason (locomotive), steam locomotive built for the Baltimore and Ohio Railroad William H. Mason
See also Bill Mason (disambiguation)