Sportsmen
- William Harris (American football) (born 1965), NFL player
- William Harris (swimmer) (1897–1961), American swimmer and Olympic bronze medallist
- William Harris (tennis) (born 1947), American tennis player
- William Harris (cricketer) (1861–1923), English cricketer
- William Harris (cricketer, born 1864) (1864–1949), English cricketer
- William Harris (footballer) (born 1890),Scottish footballer
- Will Harris, baseball player
- Willie Harris (born 1978), baseball player
- Hinky Harris (William Edward Harris, 1935–2001), Canadian ice hockey player (Toronto Maple Leafs) and head coach
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