William Forsyth may refer to:
William Forsyth (artist) (1854–1935), American Impressionist painter William Forsyth (athlete) (1891–1939), Canadian long-distance runner William Forsyth (barrister) (1812–1899), Scottish lawyer and Member of Parliament William Forsyth (horticulturist) (1737–1804), Scottish botanist William Forsyth (merchant) (1722–1800), Scottish merchant William Forsyth (rugby union) (born 1850), international player who represented Scotland William Forsyth (writer) (1818–1879), Scottish poet and journalist William Austin Forsyth, Canadian politician Will Forsyth (1996–2020), rugby league footballer who played in the 2010s Bill Forsyth (diplomat) (1909–1993), Australian diplomat Bill Forsyth (born 1946), Scottish film director and writer
See also William Forsythe (disambiguation)