Patrick Gallagher (actor) (born 1968), Canadian actor
Patrick Gallagher (designer), American designer
Patrick Gallagher (footballer), soccer player
Patrick Gallagher (venture capitalist), Co-founder of CrunchFund
Patrick Gallagher (politician) (born 1946), former Irish politician with Sinn Féin the Workers' Party, Workers Party of Ireland and Democratic Left
Patrick D. Gallagher (born 1963), 18th Chancellor of the University of Pittsburgh, physicist, and 14th director of National Institute of Standards and Technology
Patrick J. Gallagher (born 1949), President of San Francisco Giants Enterprises
Paddy Gallagher (boxer) (born 1989), Northern Irish boxer
Patrick Gallagher (racehorse trainer), American racehorse trainer
Patrick Gallagher (drummer), Drummer of Secret Eyes
Patrick Gallagher (writer), British TV writer of Round the Bend
Paddy "the Cope" Gallagher (1873–1966), founder of The Cope, or the Templecrone Agricultural Co-operative Society