William Gallagher

William Gallagher may refer to:


 * William Gallagher (baseball) (1874–1950), baseball player
 * William Gallagher (civil servant) (1851–1933), British civil servant
 * William Gallagher (politician) (1875–1946), U.S. Representative from Minnesota
 * William Gallagher (writer), British writer and journalist
 * William Davis Gallagher (1808–1894), American journalist and poet
 * William J. Gallagher (colonel), president of Riverside Military Academy in Gainesville, Georgia
 * William M. Gallagher (1923–1975), Pulitzer Prize-winning photographer
 * Bill Gallagher (baseball) (1863–1890), US baseball player
 * Bill Gallagher (inventor) (Alfred William Gallagher, 1911–1990), New Zealand businessman and inventor
 * Billy Gallagher (chef) (1948–2016), chef and businessman in South Africa
 * Billy Gallagher (footballer) (1885–1959), Australian rules footballer
 * Billy Zero (William Gallagher, born 1971), radio and TV host
 * Liam Gallagher (William John Paul Gallagher, born 1972), Oasis singer
 * Rory Gallagher (William Rory Gallagher, 1948–1995), Irish blues-rock multi-instrumentalist, songwriter, and bandleader