Peter Gallagher (disambiguation)

Peter Gallagher is an American actor.

Peter Gallagher may also refer to:


 * Peter Gallagher (comic strip artist), current writer of Heathcliff
 * Peter Gallagher (rugby league, born 1937), Australian rugby league footballer of the 1950s and 1960s who played in Queensland and represented Australia
 * Peter Gallagher (rugby league), Australian rugby league footballer of the 1960s who played in New South Wales for Easts and Manly
 * Peter T. Gallagher, Irish astrophysicist