Daniel Gallagher may refer to:
Daniel Gallagher (sheriff) (1896–1956), sheriff of the City and County of San Francisco Daniel J. Gallagher (1873–1953), American attorney and political figure in Massachusetts Daniel M. Gallagher (born 1972), Commissioner of the U.S. Securities and Exchange Commission Dan Gallagher (1957–2001), Canadian television presenter Dan Gallagher (footballer) (born 1997), English footballer, playing for Dorking Wanderers