William Gallagher
William Gallagher may refer to:
- William Gallagher (baseball), baseball player
- William Gallagher (civil servant), British civil servant
- William Gallagher (politician), U.S. Representative from Minnesota
- William Gallagher (writer), British writer and journalist
- William Davis Gallagher, American journalist and poet
- William J. Gallagher (colonel), president of Riverside Military Academy in Gainesville, Georgia
- William M. Gallagher, Pulitzer Prize-winning photographer
- Bill Gallagher (baseball), US baseball player
- Billy Gallagher (businessman), US businessman
- Bill Gallagher (inventor), New Zealand businessman and inventor
- Billy Gallagher (chef), chef and businessman in South Africa
- Billy Gallagher (footballer), Australian rules footballer
- Billy Zero, radio and TV host
- Liam Gallagher, Oasis singer
- Rory Gallagher, Irish blues-rock multi-instrumentalist, songwriter, and bandleader