Gallay is a surname. Notable people with the surname include:
Alan Gallay, American historian Ana Gallay (born 1986), Argentine beach volleyball player Bernard Gallay (born 1959), Franco-Swiss yachtsman and businessman Claudie Gallay (born 1961), French author Jacques-François Gallay (1795–1864), French horn player Mark Gallay (1914–1998), Soviet test pilot Maurice Gallay (1902–1982), French footballer Olivia Gallay Bertrand (born 1989), French skier