Peter MacGregor may refer to:
Peter MacGregor (Michigan politician) (born 1966), Republican politician from Michigan Peter MacGregor (Queensland politician) (1866–1936), member of the Queensland Legislative Assembly Peter MacGregor Chalmers (1859–1922), Scottish architect Peter MacGregor-Scott (1947–2017), British film producer, production manager, and assistant director
See also Peter McGregor (1947–2008), Australian anarchist Peter McGregor (cricketer) (born 1941), New Zealand former cricketer