William Donnelly or Willie Donnelly may refer to:
- William Earnest Donnelly, New Zealand schoolteacher
- William J. S. Donnelly (1844–1914), Newfoundland politician
- William M. Donnelly (1885–1946), American politician in Michigan
- William Donnelly (1845–1897), member of the Black Donnellys
- Willie Donnelly (footballer) (1872–1934), Irish footballer
- Willie Donnelly (hurler), Irish hurler
Fictional
edit- Will Donnelly, character on television series Love Is a Many Splendored Thing