William Rennie may refer to: William Rennie (Victoria Cross) (1822–1887), Scottish recipient of the Victoria Cross William Rennie (horticulturist) (1835–1910), scientific farmer and seed merchant in Ontario Willie Rennie (William Cowan Rennie, born 1967), Scottish politician William J. Rennie (1891–1964), American football and basketball coach William Hepburn Rennie, British colonial official in Hong Kong and St. Vincent