William Cowan may refer to:
William Cowan (footballer) (1900–1979), English footballer William Cowan (football manager) (1892–1964), Scottish football manager in Spain William Cowan (fur trader) (1818–1902), of the Hudson's Bay Company William Cowan (politician) (1825–1899), reeve of North Gower Township, Ontario William Henry Cowan (1862–1932), Scottish politician W. Maxwell Cowan (William Maxwell Cowan, 1931–2002), South African neuroscientist Mo Cowan (William Maurice Cowan, born 1969), U.S. Senator from Massachusetts William Cowan (engineer) (1823–1898) Bill Cowan (born 1943), security expert Bill Cowan (tennis) (born 1959), Canadian tennis player Billy Cowan (born 1938), retired baseball player Billy Cowan (footballer) (1896–?), Scottish footballer
See also Cowan (surname)