William Forsyth
William Forsyth may refer to:
- William Forsyth (artist), American Impressionist painter
- William Forsyth (athlete), Canadian long-distance runner
- William Forsyth (barrister), Scottish lawyer and Member of Parliament
- William Forsyth (horticulturist), Scottish botanist
- William Forsyth (merchant), Scottish merchant
- William Forsyth (rugby union), international player who represented Scotland
- William Forsyth (writer), Scottish poet and journalist
- William [Austin Forsyth], Canadian politician
- Will Forsyth, rugby league footballer who played in the 2010s
- Bill Forsyth (diplomat), Australian diplomat
- Bill Forsyth, Scottish film director and writer