William Gallagher may refer to:William Gallagher (baseball) (1874–1950), baseball player William Gallagher (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 Billy Gallagher (businessman), US businessman Bill Gallagher (inventor), 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, radio and TV host Liam Gallagher, Oasis singer Rory Gallagher, Irish blues-rock multi-instrumentalist, songwriter, and bandleader